Calculus Examples

$f (x) = y e^{- (\frac{16 x^{2} + 9 y^{2}}{288})} + x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}$

Step 1

By the Sum Rule, the derivative of $y e^{- (\frac{16 x^{2} + 9 y^{2}}{288})} + x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}$ with respect to $y$ is $\frac{d}{d y} [y e^{- (\frac{16 x^{2} + 9 y^{2}}{288})}] + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$ .

$\frac{d}{d y} [y e^{- (\frac{16 x^{2} + 9 y^{2}}{288})}] + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 2

Evaluate $\frac{d}{d y} [y e^{- (\frac{16 x^{2} + 9 y^{2}}{288})}]$ .

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Step 2.1

Differentiate using the Product Rule which states that $\frac{d}{d y} [f (y) g (y)]$ is $f (y) \frac{d}{d y} [g (y)] + g (y) \frac{d}{d y} [f (y)]$ where $f (y) = y$ and $g (y) = e^{- \frac{16 x^{2} + 9 y^{2}}{288}}$ .

$y \frac{d}{d y} [e^{- \frac{16 x^{2} + 9 y^{2}}{288}}] + e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \frac{d}{d y} [y] + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 2.2

Differentiate using the chain rule, which states that $\frac{d}{d y} [f (g (y))]$ is $f' (g (y)) g' (y)$ where $f (y) = e^{y}$ and $g (y) = - \frac{16 x^{2} + 9 y^{2}}{288}$ .

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Step 2.2.1

To apply the Chain Rule, set $u_{1}$ as $- \frac{16 x^{2} + 9 y^{2}}{288}$ .

$y (\frac{d}{d u_{1}} [e^{u_{1}}] \frac{d}{d y} [- \frac{16 x^{2} + 9 y^{2}}{288}]) + e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \frac{d}{d y} [y] + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 2.2.2

Differentiate using the Exponential Rule which states that $\frac{d}{d u_{1}} [a^{u_{1}}]$ is $a^{u_{1}} \ln (a)$ where $a$ = $e$ .

$y (e^{u_{1}} \frac{d}{d y} [- \frac{16 x^{2} + 9 y^{2}}{288}]) + e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \frac{d}{d y} [y] + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 2.2.3

Replace all occurrences of $u_{1}$ with $- \frac{16 x^{2} + 9 y^{2}}{288}$ .

$y (e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \frac{d}{d y} [- \frac{16 x^{2} + 9 y^{2}}{288}]) + e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \frac{d}{d y} [y] + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 2.3

Since $- \frac{1}{288}$ is constant with respect to $y$ , the derivative of $- \frac{16 x^{2} + 9 y^{2}}{288}$ with respect to $y$ is $- \frac{1}{288} \frac{d}{d y} [16 x^{2} + 9 y^{2}]$ .

$y (e^{- \frac{16 x^{2} + 9 y^{2}}{288}} (- \frac{1}{288} \frac{d}{d y} [16 x^{2} + 9 y^{2}])) + e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \frac{d}{d y} [y] + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 2.4

By the Sum Rule, the derivative of $16 x^{2} + 9 y^{2}$ with respect to $y$ is $\frac{d}{d y} [16 x^{2}] + \frac{d}{d y} [9 y^{2}]$ .

$y (e^{- \frac{16 x^{2} + 9 y^{2}}{288}} (- \frac{1}{288} (\frac{d}{d y} [16 x^{2}] + \frac{d}{d y} [9 y^{2}]))) + e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \frac{d}{d y} [y] + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 2.5

Since $16 x^{2}$ is constant with respect to $y$ , the derivative of $16 x^{2}$ with respect to $y$ is $0$ .

$y (e^{- \frac{16 x^{2} + 9 y^{2}}{288}} (- \frac{1}{288} (0 + \frac{d}{d y} [9 y^{2}]))) + e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \frac{d}{d y} [y] + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 2.6

Since $9$ is constant with respect to $y$ , the derivative of $9 y^{2}$ with respect to $y$ is $9 \frac{d}{d y} [y^{2}]$ .

$y (e^{- \frac{16 x^{2} + 9 y^{2}}{288}} (- \frac{1}{288} (0 + 9 \frac{d}{d y} [y^{2}]))) + e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \frac{d}{d y} [y] + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 2.7

Differentiate using the Power Rule which states that $\frac{d}{d y} [y^{n}]$ is $n y^{n - 1}$ where $n = 2$ .

$y (e^{- \frac{16 x^{2} + 9 y^{2}}{288}} (- \frac{1}{288} (0 + 9 (2 y)))) + e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \frac{d}{d y} [y] + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 2.8

Differentiate using the Power Rule which states that $\frac{d}{d y} [y^{n}]$ is $n y^{n - 1}$ where $n = 1$ .

$y (e^{- \frac{16 x^{2} + 9 y^{2}}{288}} (- \frac{1}{288} (0 + 9 (2 y)))) + e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \cdot 1 + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 2.9

Multiply $2$ by $9$ .

$y (e^{- \frac{16 x^{2} + 9 y^{2}}{288}} (- \frac{1}{288} (0 + 18 y))) + e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \cdot 1 + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 2.10

Add $0$ and $18 y$ .

$y (e^{- \frac{16 x^{2} + 9 y^{2}}{288}} (- \frac{1}{288} (18 y))) + e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \cdot 1 + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 2.11

Multiply $18$ by $- 1$ .

$y (e^{- \frac{16 x^{2} + 9 y^{2}}{288}} (- 18 (\frac{1}{288}) y)) + e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \cdot 1 + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 2.12

Combine $- 18$ and $\frac{1}{288}$ .

$y (e^{- \frac{16 x^{2} + 9 y^{2}}{288}} (\frac{- 18}{288} y)) + e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \cdot 1 + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 2.13

Combine $\frac{- 18}{288}$ and $y$ .

$y (e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \frac{- 18 y}{288}) + e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \cdot 1 + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 2.14

Cancel the common factor of $- 18$ and $288$ .

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Step 2.14.1

Factor $18$ out of $- 18 y$ .

$y (e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \frac{18 (- y)}{288}) + e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \cdot 1 + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 2.14.2

Cancel the common factors.

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Step 2.14.2.1

Factor $18$ out of $288$ .

$y (e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \frac{18 (- y)}{18 (16)}) + e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \cdot 1 + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 2.14.2.2

Cancel the common factor.

$y (e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \frac{18 (- y)}{18 \cdot 16}) + e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \cdot 1 + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 2.14.2.3

Rewrite the expression.

$y (e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \frac{- y}{16}) + e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \cdot 1 + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 2.15

Move the negative in front of the fraction.

$y (e^{- \frac{16 x^{2} + 9 y^{2}}{288}} (- \frac{y}{16})) + e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \cdot 1 + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 2.16

Combine $e^{- \frac{16 x^{2} + 9 y^{2}}{288}}$ and $\frac{y}{16}$ .

$y (- \frac{e^{- \frac{16 x^{2} + 9 y^{2}}{288}} y}{16}) + e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \cdot 1 + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 2.17

Combine $y$ and $\frac{e^{- \frac{16 x^{2} + 9 y^{2}}{288}} y}{16}$ .

$- \frac{y (e^{- \frac{16 x^{2} + 9 y^{2}}{288}} y)}{16} + e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \cdot 1 + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 2.18

Raise $y$ to the power of $1$ .

$- \frac{y^{1} y e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} + e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \cdot 1 + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 2.19

Raise $y$ to the power of $1$ .

$- \frac{y^{1} y^{1} e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} + e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \cdot 1 + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 2.20

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$- \frac{y^{1 + 1} e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} + e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \cdot 1 + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 2.21

Add $1$ and $1$ .

$- \frac{y^{2} e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} + e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \cdot 1 + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 2.22

Multiply $e^{- \frac{16 x^{2} + 9 y^{2}}{288}}$ by $1$ .

$- \frac{y^{2} e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} + e^{- \frac{16 x^{2} + 9 y^{2}}{288}} + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 2.23

To write $e^{- \frac{16 x^{2} + 9 y^{2}}{288}}$ as a fraction with a common denominator, multiply by $\frac{16}{16}$ .

$- \frac{y^{2} e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} + e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \cdot \frac{16}{16} + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 2.24

Combine $e^{- \frac{16 x^{2} + 9 y^{2}}{288}}$ and $\frac{16}{16}$ .

$- \frac{y^{2} e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} + \frac{e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \cdot 16}{16} + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 2.25

Combine the numerators over the common denominator.

$\frac{- y^{2} e^{- \frac{16 x^{2} + 9 y^{2}}{288}} + e^{- \frac{16 x^{2} + 9 y^{2}}{288}} \cdot 16}{16} + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 2.26

Move $16$ to the left of $e^{- \frac{16 x^{2} + 9 y^{2}}{288}}$ .

$\frac{- y^{2} e^{- \frac{16 x^{2} + 9 y^{2}}{288}} + 16 e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} + \frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 3

Evaluate $\frac{d}{d y} [x y (- \frac{x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$ .

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Step 3.1

Combine $x$ and $\frac{x}{9}$ .

$\frac{- y^{2} e^{- \frac{16 x^{2} + 9 y^{2}}{288}} + 16 e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} + \frac{d}{d y} [y (- \frac{x \cdot x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 3.2

Raise $x$ to the power of $1$ .

$\frac{- y^{2} e^{- \frac{16 x^{2} + 9 y^{2}}{288}} + 16 e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} + \frac{d}{d y} [y (- \frac{x^{1} x}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 3.3

Raise $x$ to the power of $1$ .

$\frac{- y^{2} e^{- \frac{16 x^{2} + 9 y^{2}}{288}} + 16 e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} + \frac{d}{d y} [y (- \frac{x^{1} x^{1}}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 3.4

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\frac{- y^{2} e^{- \frac{16 x^{2} + 9 y^{2}}{288}} + 16 e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} + \frac{d}{d y} [y (- \frac{x^{1 + 1}}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 3.5

Add $1$ and $1$ .

$\frac{- y^{2} e^{- \frac{16 x^{2} + 9 y^{2}}{288}} + 16 e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} + \frac{d}{d y} [y (- \frac{x^{2}}{9}) e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 3.6

Combine $y$ and $\frac{x^{2}}{9}$ .

$\frac{- y^{2} e^{- \frac{16 x^{2} + 9 y^{2}}{288}} + 16 e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} + \frac{d}{d y} [- \frac{y x^{2}}{9} e^{- (\frac{16 x^{2} + y^{2}}{288})}]$

Step 3.7

Combine $e^{- \frac{16 x^{2} + y^{2}}{288}}$ and $\frac{y x^{2}}{9}$ .

$\frac{- y^{2} e^{- \frac{16 x^{2} + 9 y^{2}}{288}} + 16 e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} + \frac{d}{d y} [- \frac{e^{- \frac{16 x^{2} + y^{2}}{288}} (y x^{2})}{9}]$

Step 3.8

Since $- \frac{x^{2}}{9}$ is constant with respect to $y$ , the derivative of $- \frac{e^{- \frac{16 x^{2} + y^{2}}{288}} (y x^{2})}{9}$ with respect to $y$ is $- \frac{x^{2}}{9} \frac{d}{d y} [e^{- \frac{16 x^{2} + y^{2}}{288}} (y)]$ .

$\frac{- y^{2} e^{- \frac{16 x^{2} + 9 y^{2}}{288}} + 16 e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} - \frac{x^{2}}{9} \frac{d}{d y} [e^{- \frac{16 x^{2} + y^{2}}{288}} (y)]$

Step 3.9

Differentiate using the Product Rule which states that $\frac{d}{d y} [f (y) g (y)]$ is $f (y) \frac{d}{d y} [g (y)] + g (y) \frac{d}{d y} [f (y)]$ where $f (y) = e^{- \frac{16 x^{2} + y^{2}}{288}}$ and $g (y) = y$ .

$\frac{- y^{2} e^{- \frac{16 x^{2} + 9 y^{2}}{288}} + 16 e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} - \frac{x^{2}}{9} (e^{- \frac{16 x^{2} + y^{2}}{288}} \frac{d}{d y} [y] + y \frac{d}{d y} [e^{- \frac{16 x^{2} + y^{2}}{288}}])$

Step 3.10

Differentiate using the Power Rule which states that $\frac{d}{d y} [y^{n}]$ is $n y^{n - 1}$ where $n = 1$ .

$\frac{- y^{2} e^{- \frac{16 x^{2} + 9 y^{2}}{288}} + 16 e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} - \frac{x^{2}}{9} (e^{- \frac{16 x^{2} + y^{2}}{288}} \cdot 1 + y \frac{d}{d y} [e^{- \frac{16 x^{2} + y^{2}}{288}}])$

Step 3.11

Differentiate using the chain rule, which states that $\frac{d}{d y} [f (g (y))]$ is $f' (g (y)) g' (y)$ where $f (y) = e^{y}$ and $g (y) = - \frac{16 x^{2} + y^{2}}{288}$ .

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Step 3.11.1

To apply the Chain Rule, set $u_{2}$ as $- \frac{16 x^{2} + y^{2}}{288}$ .

$\frac{- y^{2} e^{- \frac{16 x^{2} + 9 y^{2}}{288}} + 16 e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} - \frac{x^{2}}{9} (e^{- \frac{16 x^{2} + y^{2}}{288}} \cdot 1 + y (\frac{d}{d u_{2}} [e^{u_{2}}] \frac{d}{d y} [- \frac{16 x^{2} + y^{2}}{288}]))$

Step 3.11.2

Differentiate using the Exponential Rule which states that $\frac{d}{d u_{2}} [a^{u_{2}}]$ is $a^{u_{2}} \ln (a)$ where $a$ = $e$ .

$\frac{- y^{2} e^{- \frac{16 x^{2} + 9 y^{2}}{288}} + 16 e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} - \frac{x^{2}}{9} (e^{- \frac{16 x^{2} + y^{2}}{288}} \cdot 1 + y (e^{u_{2}} \frac{d}{d y} [- \frac{16 x^{2} + y^{2}}{288}]))$

Step 3.11.3

Replace all occurrences of $u_{2}$ with $- \frac{16 x^{2} + y^{2}}{288}$ .

$\frac{- y^{2} e^{- \frac{16 x^{2} + 9 y^{2}}{288}} + 16 e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} - \frac{x^{2}}{9} (e^{- \frac{16 x^{2} + y^{2}}{288}} \cdot 1 + y (e^{- \frac{16 x^{2} + y^{2}}{288}} \frac{d}{d y} [- \frac{16 x^{2} + y^{2}}{288}]))$

Step 3.12

Since $- \frac{1}{288}$ is constant with respect to $y$ , the derivative of $- \frac{16 x^{2} + y^{2}}{288}$ with respect to $y$ is $- \frac{1}{288} \frac{d}{d y} [16 x^{2} + y^{2}]$ .

Step 3.13

By the Sum Rule, the derivative of $16 x^{2} + y^{2}$ with respect to $y$ is $\frac{d}{d y} [16 x^{2}] + \frac{d}{d y} [y^{2}]$ .

Step 3.14

Since $16 x^{2}$ is constant with respect to $y$ , the derivative of $16 x^{2}$ with respect to $y$ is $0$ .

Step 3.15

Differentiate using the Power Rule which states that $\frac{d}{d y} [y^{n}]$ is $n y^{n - 1}$ where $n = 2$ .

Step 3.16

Multiply $e^{- \frac{16 x^{2} + y^{2}}{288}}$ by $1$ .

$\frac{- y^{2} e^{- \frac{16 x^{2} + 9 y^{2}}{288}} + 16 e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} - \frac{x^{2}}{9} (e^{- \frac{16 x^{2} + y^{2}}{288}} + y (e^{- \frac{16 x^{2} + y^{2}}{288}} (- \frac{1}{288} (0 + 2 y))))$

Step 3.17

Add $0$ and $2 y$ .

Step 3.18

Multiply $2$ by $- 1$ .

Step 3.19

Combine $- 2$ and $\frac{1}{288}$ .

Step 3.20

Combine $\frac{- 2}{288}$ and $y$ .

Step 3.21

Cancel the common factor of $- 2$ and $288$ .

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Step 3.21.1

Factor $2$ out of $- 2 y$ .

Step 3.21.2

Cancel the common factors.

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Step 3.21.2.1

Factor $2$ out of $288$ .

Step 3.21.2.2

Cancel the common factor.

Step 3.21.2.3

Rewrite the expression.

Step 3.22

Move the negative in front of the fraction.

Step 3.23

Combine $e^{- \frac{16 x^{2} + y^{2}}{288}}$ and $\frac{y}{144}$ .

$\frac{- y^{2} e^{- \frac{16 x^{2} + 9 y^{2}}{288}} + 16 e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} - \frac{x^{2}}{9} (e^{- \frac{16 x^{2} + y^{2}}{288}} + y (- \frac{e^{- \frac{16 x^{2} + y^{2}}{288}} y}{144}))$

Step 3.24

Combine $y$ and $\frac{e^{- \frac{16 x^{2} + y^{2}}{288}} y}{144}$ .

$\frac{- y^{2} e^{- \frac{16 x^{2} + 9 y^{2}}{288}} + 16 e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} - \frac{x^{2}}{9} (e^{- \frac{16 x^{2} + y^{2}}{288}} - \frac{y (e^{- \frac{16 x^{2} + y^{2}}{288}} y)}{144})$

Step 3.25

Raise $y$ to the power of $1$ .

$\frac{- y^{2} e^{- \frac{16 x^{2} + 9 y^{2}}{288}} + 16 e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} - \frac{x^{2}}{9} (e^{- \frac{16 x^{2} + y^{2}}{288}} - \frac{y^{1} y e^{- \frac{16 x^{2} + y^{2}}{288}}}{144})$

Step 3.26

Raise $y$ to the power of $1$ .

$\frac{- y^{2} e^{- \frac{16 x^{2} + 9 y^{2}}{288}} + 16 e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} - \frac{x^{2}}{9} (e^{- \frac{16 x^{2} + y^{2}}{288}} - \frac{y^{1} y^{1} e^{- \frac{16 x^{2} + y^{2}}{288}}}{144})$

Step 3.27

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\frac{- y^{2} e^{- \frac{16 x^{2} + 9 y^{2}}{288}} + 16 e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} - \frac{x^{2}}{9} (e^{- \frac{16 x^{2} + y^{2}}{288}} - \frac{y^{1 + 1} e^{- \frac{16 x^{2} + y^{2}}{288}}}{144})$

Step 3.28

Add $1$ and $1$ .

$\frac{- y^{2} e^{- \frac{16 x^{2} + 9 y^{2}}{288}} + 16 e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} - \frac{x^{2}}{9} (e^{- \frac{16 x^{2} + y^{2}}{288}} - \frac{y^{2} e^{- \frac{16 x^{2} + y^{2}}{288}}}{144})$

Step 3.29

To write $e^{- \frac{16 x^{2} + y^{2}}{288}}$ as a fraction with a common denominator, multiply by $\frac{144}{144}$ .

$\frac{- y^{2} e^{- \frac{16 x^{2} + 9 y^{2}}{288}} + 16 e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} - \frac{x^{2}}{9} (e^{- \frac{16 x^{2} + y^{2}}{288}} \cdot \frac{144}{144} - \frac{y^{2} e^{- \frac{16 x^{2} + y^{2}}{288}}}{144})$

Step 3.30

Combine $e^{- \frac{16 x^{2} + y^{2}}{288}}$ and $\frac{144}{144}$ .

$\frac{- y^{2} e^{- \frac{16 x^{2} + 9 y^{2}}{288}} + 16 e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} - \frac{x^{2}}{9} (\frac{e^{- \frac{16 x^{2} + y^{2}}{288}} \cdot 144}{144} - \frac{y^{2} e^{- \frac{16 x^{2} + y^{2}}{288}}}{144})$

Step 3.31

Combine the numerators over the common denominator.

$\frac{- y^{2} e^{- \frac{16 x^{2} + 9 y^{2}}{288}} + 16 e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} - \frac{x^{2}}{9} \cdot \frac{e^{- \frac{16 x^{2} + y^{2}}{288}} \cdot 144 - y^{2} e^{- \frac{16 x^{2} + y^{2}}{288}}}{144}$

Step 3.32

Move $144$ to the left of $e^{- \frac{16 x^{2} + y^{2}}{288}}$ .

$\frac{- y^{2} e^{- \frac{16 x^{2} + 9 y^{2}}{288}} + 16 e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} - \frac{x^{2}}{9} \cdot \frac{144 \cdot e^{- \frac{16 x^{2} + y^{2}}{288}} - y^{2} e^{- \frac{16 x^{2} + y^{2}}{288}}}{144}$

Step 3.33

Multiply $\frac{144 e^{- \frac{16 x^{2} + y^{2}}{288}} - y^{2} e^{- \frac{16 x^{2} + y^{2}}{288}}}{144}$ by $\frac{x^{2}}{9}$ .

$\frac{- y^{2} e^{- \frac{16 x^{2} + 9 y^{2}}{288}} + 16 e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} - \frac{(144 e^{- \frac{16 x^{2} + y^{2}}{288}} - y^{2} e^{- \frac{16 x^{2} + y^{2}}{288}}) x^{2}}{144 \cdot 9}$

Step 3.34

Multiply $144$ by $9$ .

Step 4

Apply the distributive property.

$\frac{- y^{2} e^{- \frac{16 x^{2} + 9 y^{2}}{288}} + 16 e^{- \frac{16 x^{2} + 9 y^{2}}{288}}}{16} - \frac{144 e^{- \frac{16 x^{2} + y^{2}}{288}} x^{2} - y^{2} e^{- \frac{16 x^{2} + y^{2}}{288}} x^{2}}{1296}$