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Popular >

derivative of e^{4x}cos(2x)

Solution

\frac{d}{d x} (e^{4 x} cos (2 x))

Solution

4 e^{4 x} cos (2 x) - 2 e^{4 x} sin (2 x)

Solution steps

\frac{d}{d x} (e^{4 x} cos (2 x))

Apply the Product Rule:

(f \cdot g)^{'} = f^{'} \cdot g + f \cdot g^{'}

f = e^{4 x}, g = cos (2 x)

= \frac{d}{d x} (e^{4 x}) cos (2 x) + \frac{d}{d x} (cos (2 x)) e^{4 x}

\frac{d}{d x} (e^{4 x}) = e^{4 x} \cdot 4

\frac{d}{d x} (cos (2 x)) = - sin (2 x) \cdot 2

= e^{4 x} \cdot 4 cos (2 x) + (- sin (2 x) \cdot 2) e^{4 x}

Simplify

= 4 e^{4 x} cos (2 x) - 2 e^{4 x} sin (2 x)

Graph

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Frequently Asked Questions (FAQ)

What is the derivative of e^{4x}cos(2x) ?
The derivative of e^{4x}cos(2x) is 4e^{4x}cos(2x)-2e^{4x}sin(2x)
What is the first derivative of e^{4x}cos(2x) ?
The first derivative of e^{4x}cos(2x) is 4e^{4x}cos(2x)-2e^{4x}sin(2x)