What is the integral of 5e^{4x}cos(x) ?

The integral of 5e^{4x}cos(x) is 5((e^{4x}sin(x))/(17)+(4e^{4x}cos(x))/(17))+C

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integral of 5e^{4x}cos(x)

\int 5 e^{4 x} cos (x) d x

5 (\frac{e ^{4 x} sin ( x )}{17} + \frac{4 e ^{4 x} cos ( x )}{17}) + C

Solution steps

\int 5 e^{4 x} cos (x) d x

Take the constant out:

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

= 5 \cdot \int e^{4 x} cos (x) d x

Apply Integration By Parts

= 5 (e^{4 x} sin (x) - \int e^{4 x} \cdot 4 sin (x) d x)

Take the constant out:

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

= 5 (e^{4 x} sin (x) - 4 \cdot \int e^{4 x} sin (x) d x)

Apply Integration By Parts

= 5 (e^{4 x} sin (x) - 4 (- e^{4 x} cos (x) - \int - 4 e^{4 x} cos (x) d x))

Take the constant out:

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

= 5 (e^{4 x} sin (x) - 4 (- e^{4 x} cos (x) - (- 4 \cdot \int e^{4 x} cos (x) d x)))

Therefore

5 \cdot \int e^{4 x} cos (x) d x = 5 (e^{4 x} sin (x) - 4 (- e^{4 x} cos (x) - (- 4 \cdot \int e^{4 x} cos (x) d x)))

Isolate

\int e^{4 x} cos (x) d x

= 5 (\frac{e ^{4 x} sin ( x )}{17} + \frac{4 e ^{4 x} cos ( x )}{17})

Add a constant to the solution

= 5 (\frac{e ^{4 x} sin ( x )}{17} + \frac{4 e ^{4 x} cos ( x )}{17}) + C

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What is the integral of 5e^{4x}cos(x) ?
The integral of 5e^{4x}cos(x) is 5((e^{4x}sin(x))/(17)+(4e^{4x}cos(x))/(17))+C