Calculus Examples

$x^{3} \sin (3 x^{2})$

Step 1

Differentiate using the Product Rule which states that $\frac{d}{d x} [f (x) g (x)]$ is $f (x) \frac{d}{d x} [g (x)] + g (x) \frac{d}{d x} [f (x)]$ where $f (x) = x^{3}$ and $g (x) = \sin (3 x^{2})$ .

$x^{3} \frac{d}{d x} [\sin (3 x^{2})] + \sin (3 x^{2}) \frac{d}{d x} [x^{3}]$

Step 2

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = \sin (x)$ and $g (x) = 3 x^{2}$ .

Tap for more steps...

Step 2.1

To apply the Chain Rule, set $u$ as $3 x^{2}$ .

$x^{3} (\frac{d}{d u} [\sin (u)] \frac{d}{d x} [3 x^{2}]) + \sin (3 x^{2}) \frac{d}{d x} [x^{3}]$

Step 2.2

The derivative of $\sin (u)$ with respect to $u$ is $\cos (u)$ .

$x^{3} (\cos (u) \frac{d}{d x} [3 x^{2}]) + \sin (3 x^{2}) \frac{d}{d x} [x^{3}]$

Step 2.3

Replace all occurrences of $u$ with $3 x^{2}$ .

$x^{3} (\cos (3 x^{2}) \frac{d}{d x} [3 x^{2}]) + \sin (3 x^{2}) \frac{d}{d x} [x^{3}]$

Step 3

Differentiate.

Tap for more steps...

Step 3.1

Since $3$ is constant with respect to $x$ , the derivative of $3 x^{2}$ with respect to $x$ is $3 \frac{d}{d x} [x^{2}]$ .

$x^{3} (\cos (3 x^{2}) (3 \frac{d}{d x} [x^{2}])) + \sin (3 x^{2}) \frac{d}{d x} [x^{3}]$

Step 3.2

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

$x^{3} (\cos (3 x^{2}) (3 (2 x))) + \sin (3 x^{2}) \frac{d}{d x} [x^{3}]$

Step 3.3

Multiply $2$ by $3$ .

$x^{3} (\cos (3 x^{2}) (6 x)) + \sin (3 x^{2}) \frac{d}{d x} [x^{3}]$

Step 4

Multiply $x^{3}$ by $x$ by adding the exponents.

Tap for more steps...

Step 4.1

Move $x$ .

$x \cdot x^{3} (\cos (3 x^{2}) \cdot (6)) + \sin (3 x^{2}) \frac{d}{d x} [x^{3}]$

Step 4.2

Multiply $x$ by $x^{3}$ .

Tap for more steps...

Step 4.2.1

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

$x^{1} x^{3} (\cos (3 x^{2}) \cdot (6)) + \sin (3 x^{2}) \frac{d}{d x} [x^{3}]$

Step 4.2.2

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

$x^{1 + 3} (\cos (3 x^{2}) \cdot (6)) + \sin (3 x^{2}) \frac{d}{d x} [x^{3}]$

Step 4.3

Add $1$ and $3$ .

$x^{4} (\cos (3 x^{2}) \cdot (6)) + \sin (3 x^{2}) \frac{d}{d x} [x^{3}]$

Step 5

Move $6$ to the left of $\cos (3 x^{2})$ .

$x^{4} (6 \cdot \cos (3 x^{2})) + \sin (3 x^{2}) \frac{d}{d x} [x^{3}]$

Step 6

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 3$ .

$x^{4} (6 \cos (3 x^{2})) + \sin (3 x^{2}) (3 x^{2})$

Step 7

Reorder terms.

$6 x^{4} \cos (3 x^{2}) + 3 x^{2} \sin (3 x^{2})$