What is the integral of 4e^{-4x}sin(4x) ?

The integral of 4e^{-4x}sin(4x) is 4(-(e^{-4x}cos(4x))/8-(e^{-4x}sin(4x))/8)+C

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integral of 4e^{-4x}sin(4x)

\int 4 e^{- 4 x} sin (4 x) d x

4 (- \frac{e ^{- 4 x} cos ( 4 x )}{8} - \frac{e ^{- 4 x} sin ( 4 x )}{8}) + C

Solution steps

\int 4 e^{- 4 x} sin (4 x) d x

Take the constant out:

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

= 4 \cdot \int e^{- 4 x} sin (4 x) d x

Apply Integration By Parts

= 4 (- \frac{1}{4} e^{- 4 x} cos (4 x) - \int e^{- 4 x} cos (4 x) d x)

Apply Integration By Parts

= 4 (- \frac{1}{4} e^{- 4 x} cos (4 x) - (\frac{1}{4} e^{- 4 x} sin (4 x) - \int - e^{- 4 x} sin (4 x) d x))

Take the constant out:

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

= 4 (- \frac{1}{4} e^{- 4 x} cos (4 x) - (\frac{1}{4} e^{- 4 x} sin (4 x) - (- \int e^{- 4 x} sin (4 x) d x)))

Therefore

4 \cdot \int e^{- 4 x} sin (4 x) d x = 4 (- \frac{1}{4} e^{- 4 x} cos (4 x) - (\frac{1}{4} e^{- 4 x} sin (4 x) - (- \int e^{- 4 x} sin (4 x) d x)))

Isolate

\int e^{- 4 x} sin (4 x) d x

= 4 (- \frac{e ^{- 4 x} cos ( 4 x )}{8} - \frac{e ^{- 4 x} sin ( 4 x )}{8})

Add a constant to the solution

= 4 (- \frac{e ^{- 4 x} cos ( 4 x )}{8} - \frac{e ^{- 4 x} sin ( 4 x )}{8}) + C

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What is the integral of 4e^{-4x}sin(4x) ?
The integral of 4e^{-4x}sin(4x) is 4(-(e^{-4x}cos(4x))/8-(e^{-4x}sin(4x))/8)+C