Calculus Examples

$y = x \tan (x)$

Step 1

Differentiate both sides of the equation.

$\frac{d}{d x} (y) = \frac{d}{d x} (x \tan (x))$

Step 2

The derivative of $y$ with respect to $x$ is $y'$ .

$y'$

Step 3

Differentiate the right side of the equation.

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Step 3.1

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 $f (x) = x$ and $g (x) = \tan (x)$ .

$x \frac{d}{d x} [\tan (x)] + \tan (x) \frac{d}{d x} [x]$

Step 3.2

The derivative of $\tan (x)$ with respect to $x$ is $\sec^{2} (x)$ .

$x \sec^{2} (x) + \tan (x) \frac{d}{d x} [x]$

Step 3.3

Differentiate using the Power Rule.

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Step 3.3.1

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

$x \sec^{2} (x) + \tan (x) \cdot 1$

Step 3.3.2

Multiply $\tan (x)$ by $1$ .

$x \sec^{2} (x) + \tan (x)$

Step 4

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

$y' = x \sec^{2} (x) + \tan (x)$

Step 5

Replace $y'$ with $\frac{d y}{d x}$ .

$\frac{d y}{d x} = x \sec^{2} (x) + \tan (x)$