Calculus Examples

$y = (- x^{2} + e^{x}) (2 \sin (x) + \cos (x))$

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 $f (x) = - x^{2} + e^{x}$ and $g (x) = 2 \sin (x) + \cos (x)$ .

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

Step 2

Differentiate.

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Step 2.1

By the Sum Rule, the derivative of $2 \sin (x) + \cos (x)$ with respect to $x$ is $\frac{d}{d x} [2 \sin (x)] + \frac{d}{d x} [\cos (x)]$ .

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

Step 2.2

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

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

Step 3

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

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

Step 4

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

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

Step 5

Differentiate.

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Step 5.1

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

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

Step 5.2

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

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

Step 5.3

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

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

Step 5.4

Multiply $2$ by $- 1$ .

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

Step 6

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

$(- x^{2} + e^{x}) (2 \cos (x) - \sin (x)) + (2 \sin (x) + \cos (x)) (- 2 x + e^{x})$

Step 7

Reorder terms.

$(- x^{2} + e^{x}) (2 \cos (x) - \sin (x)) + (- 2 x + e^{x}) (2 \sin (x) + \cos (x))$