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Popular >

derivative of e^{-3x}cos(3x)

Solution

\frac{d}{d x} (e^{- 3 x} cos (3 x))

Solution

- 3 e^{- 3 x} cos (3 x) - 3 e^{- 3 x} sin (3 x)

Solution steps

\frac{d}{d x} (e^{- 3 x} cos (3 x))

Apply the Product Rule:

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

f = e^{- 3 x}, g = cos (3 x)

= \frac{d}{d x} (e^{- 3 x}) cos (3 x) + \frac{d}{d x} (cos (3 x)) e^{- 3 x}

\frac{d}{d x} (e^{- 3 x}) = - 3 e^{- 3 x}

\frac{d}{d x} (cos (3 x)) = - sin (3 x) \cdot 3

= (- 3 e^{- 3 x}) cos (3 x) + (- sin (3 x) \cdot 3) e^{- 3 x}

Simplify

= - 3 e^{- 3 x} cos (3 x) - 3 e^{- 3 x} sin (3 x)

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Frequently Asked Questions (FAQ)

What is the derivative of e^{-3x}cos(3x) ?
The derivative of e^{-3x}cos(3x) is -3e^{-3x}cos(3x)-3e^{-3x}sin(3x)
What is the first derivative of e^{-3x}cos(3x) ?
The first derivative of e^{-3x}cos(3x) is -3e^{-3x}cos(3x)-3e^{-3x}sin(3x)