Calculus Examples

$y = arccot (\sqrt{t})$

Step 1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{t}$ as $t^{\frac{1}{2}}$ .

$y = arccot (t^{\frac{1}{2}})$

Step 2

Differentiate both sides of the equation.

$\frac{d}{d t} (y) = \frac{d}{d t} (arccot (t^{\frac{1}{2}}))$

Step 3

The derivative of $y$ with respect to $t$ is $y'$ .

$y'$

Step 4

Differentiate the right side of the equation.

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Step 4.1

Differentiate using the chain rule, which states that $\frac{d}{d t} [f (g (t))]$ is $f' (g (t)) g' (t)$ where $f (t) = arccot (t)$ and $g (t) = t^{\frac{1}{2}}$ .

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Step 4.1.1

To apply the Chain Rule, set $u$ as $t^{\frac{1}{2}}$ .

$\frac{d}{d u} [arccot (u)] \frac{d}{d t} [t^{\frac{1}{2}}]$

Step 4.1.2

The derivative of $arccot (u)$ with respect to $u$ is $- \frac{1}{1 + u^{2}}$ .

$- \frac{1}{1 + u^{2}} \frac{d}{d t} [t^{\frac{1}{2}}]$

Step 4.1.3

Replace all occurrences of $u$ with $t^{\frac{1}{2}}$ .

$- \frac{1}{1 + {(t^{\frac{1}{2}})}^{2}} \frac{d}{d t} [t^{\frac{1}{2}}]$

Step 4.2

Multiply the exponents in ${(t^{\frac{1}{2}})}^{2}$ .

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Step 4.2.1

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$- \frac{1}{1 + t^{\frac{1}{2} \cdot 2}} \frac{d}{d t} [t^{\frac{1}{2}}]$

Step 4.2.2

Cancel the common factor of $2$ .

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Step 4.2.2.1

Cancel the common factor.

$- \frac{1}{1 + t^{\frac{1}{2} \cdot 2}} \frac{d}{d t} [t^{\frac{1}{2}}]$

Step 4.2.2.2

Rewrite the expression.

$- \frac{1}{1 + t^{1}} \frac{d}{d t} [t^{\frac{1}{2}}]$

Step 4.3

Simplify.

$- \frac{1}{1 + t} \frac{d}{d t} [t^{\frac{1}{2}}]$

Step 4.4

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

$- \frac{1}{1 + t} (\frac{1}{2} t^{\frac{1}{2} - 1})$

Step 4.5

To write $- 1$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$- \frac{1}{1 + t} (\frac{1}{2} t^{\frac{1}{2} - 1 \cdot \frac{2}{2}})$

Step 4.6

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

$- \frac{1}{1 + t} (\frac{1}{2} t^{\frac{1}{2} + \frac{- 1 \cdot 2}{2}})$

Step 4.7

Combine the numerators over the common denominator.

$- \frac{1}{1 + t} (\frac{1}{2} t^{\frac{1 - 1 \cdot 2}{2}})$

Step 4.8

Simplify the numerator.

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Step 4.8.1

Multiply $- 1$ by $2$ .

$- \frac{1}{1 + t} (\frac{1}{2} t^{\frac{1 - 2}{2}})$

Step 4.8.2

Subtract $2$ from $1$ .

$- \frac{1}{1 + t} (\frac{1}{2} t^{\frac{- 1}{2}})$

Step 4.9

Move the negative in front of the fraction.

$- \frac{1}{1 + t} (\frac{1}{2} t^{- \frac{1}{2}})$

Step 4.10

Combine $\frac{1}{2}$ and $t^{- \frac{1}{2}}$ .

$- \frac{1}{1 + t} \cdot \frac{t^{- \frac{1}{2}}}{2}$

Step 4.11

Multiply $\frac{t^{- \frac{1}{2}}}{2}$ by $\frac{1}{1 + t}$ .

$- \frac{t^{- \frac{1}{2}}}{2 (1 + t)}$

Step 4.12

Move $t^{- \frac{1}{2}}$ to the denominator using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$- \frac{1}{2 (1 + t) t^{\frac{1}{2}}}$

Step 4.13

Simplify.

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Step 4.13.1

Apply the distributive property.

$- \frac{1}{(2 \cdot 1 + 2 t) t^{\frac{1}{2}}}$

Step 4.13.2

Apply the distributive property.

$- \frac{1}{2 \cdot 1 t^{\frac{1}{2}} + 2 t \cdot t^{\frac{1}{2}}}$

Step 4.13.3

Combine terms.

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Step 4.13.3.1

Multiply $2$ by $1$ .

$- \frac{1}{2 t^{\frac{1}{2}} + 2 t \cdot t^{\frac{1}{2}}}$

Step 4.13.3.2

Multiply $t$ by $t^{\frac{1}{2}}$ by adding the exponents.

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Step 4.13.3.2.1

Move $t^{\frac{1}{2}}$ .

$- \frac{1}{2 t^{\frac{1}{2}} + 2 (t^{\frac{1}{2}} t)}$

Step 4.13.3.2.2

Multiply $t^{\frac{1}{2}}$ by $t$ .

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Step 4.13.3.2.2.1

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

$- \frac{1}{2 t^{\frac{1}{2}} + 2 (t^{\frac{1}{2}} t^{1})}$

Step 4.13.3.2.2.2

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

$- \frac{1}{2 t^{\frac{1}{2}} + 2 t^{\frac{1}{2} + 1}}$

Step 4.13.3.2.3

Write $1$ as a fraction with a common denominator.

$- \frac{1}{2 t^{\frac{1}{2}} + 2 t^{\frac{1}{2} + \frac{2}{2}}}$

Step 4.13.3.2.4

Combine the numerators over the common denominator.

$- \frac{1}{2 t^{\frac{1}{2}} + 2 t^{\frac{1 + 2}{2}}}$

Step 4.13.3.2.5

Add $1$ and $2$ .

$- \frac{1}{2 t^{\frac{1}{2}} + 2 t^{\frac{3}{2}}}$

Step 4.13.4

Simplify the denominator.

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Step 4.13.4.1

Factor $2 t^{\frac{1}{2}}$ out of $2 t^{\frac{1}{2}} + 2 t^{\frac{3}{2}}$ .

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Step 4.13.4.1.1

Factor $2 t^{\frac{1}{2}}$ out of $2 t^{\frac{1}{2}}$ .

$- \frac{1}{2 t^{\frac{1}{2}} (1) + 2 t^{\frac{3}{2}}}$

Step 4.13.4.1.2

Factor $2 t^{\frac{1}{2}}$ out of $2 t^{\frac{3}{2}}$ .

$- \frac{1}{2 t^{\frac{1}{2}} (1) + 2 t^{\frac{1}{2}} (t^{\frac{2}{2}})}$

Step 4.13.4.1.3

Factor $2 t^{\frac{1}{2}}$ out of $2 t^{\frac{1}{2}} (1) + 2 t^{\frac{1}{2}} (t^{\frac{2}{2}})$ .

$- \frac{1}{2 t^{\frac{1}{2}} (1 + t^{\frac{2}{2}})}$

Step 4.13.4.2

Divide $2$ by $2$ .

$- \frac{1}{2 t^{\frac{1}{2}} (1 + t^{1})}$

Step 4.13.4.3

Simplify.

$- \frac{1}{2 t^{\frac{1}{2}} (1 + t)}$

Step 5

Reform the equation by setting the left side equal to the right side.

$y' = - \frac{1}{2 t^{\frac{1}{2}} (1 + t)}$

Step 6

Replace $y'$ with $\frac{d y}{d t}$ .

$\frac{d y}{d t} = - \frac{1}{2 t^{\frac{1}{2}} (1 + t)}$