What is the integral of sin(2x)e^{-x} ?

The integral of sin(2x)e^{-x} is -(2e^{-x}cos(2x))/5-(e^{-x}sin(2x))/5+C

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integral of sin(2x)e^{-x}

\int sin (2 x) e^{- x} d x

- \frac{2 e ^{- x} cos ( 2 x )}{5} - \frac{e ^{- x} sin ( 2 x )}{5} + C

Solution steps

\int sin (2 x) e^{- x} d x

Apply Integration By Parts

: - \frac{1}{2} e^{- x} cos (2 x) - \int \frac{1}{2} e^{- x} cos (2 x) d x

= - \frac{1}{2} e^{- x} cos (2 x) - \int \frac{1}{2} e^{- x} cos (2 x) d x

Take the constant out:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

= - \frac{1}{2} e^{- x} cos (2 x) - \frac{1}{2} \cdot \int e^{- x} cos (2 x) d x

Apply Integration By Parts

: \frac{1}{2} e^{- x} sin (2 x) - \int - \frac{1}{2} e^{- x} sin (2 x) d x

= - \frac{1}{2} e^{- x} cos (2 x) - \frac{1}{2} (\frac{1}{2} e^{- x} sin (2 x) - \int - \frac{1}{2} e^{- x} sin (2 x) d x)

Take the constant out:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

= - \frac{1}{2} e^{- x} cos (2 x) - \frac{1}{2} (\frac{1}{2} e^{- x} sin (2 x) - (- \frac{1}{2} \cdot \int e^{- x} sin (2 x) d x))

Therefore

\int e^{- x} sin (2 x) d x = - \frac{1}{2} e^{- x} cos (2 x) - \frac{1}{2} (\frac{1}{2} e^{- x} sin (2 x) - (- \frac{1}{2} \cdot \int e^{- x} sin (2 x) d x))

Isolate

\int e^{- x} sin (2 x) d x

= - \frac{2 e ^{- x} cos ( 2 x )}{5} - \frac{e ^{- x} sin ( 2 x )}{5}

Add a constant to the solution

= - \frac{2 e ^{- x} cos ( 2 x )}{5} - \frac{e ^{- x} sin ( 2 x )}{5} + C

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What is the integral of sin(2x)e^{-x} ?
The integral of sin(2x)e^{-x} is -(2e^{-x}cos(2x))/5-(e^{-x}sin(2x))/5+C