What is the integral of e^xcos(7x) ?

The integral of e^xcos(7x) is (7e^xsin(7x))/(50)+(e^xcos(7x))/(50)+C

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integral of e^xcos(7x)

\int e^{x} cos (7 x) d x

\frac{7 e ^{x} sin ( 7 x )}{50} + \frac{e ^{x} cos ( 7 x )}{50} + C

Solution steps

\int e^{x} cos (7 x) d x

Apply Integration By Parts

= e^{x} \frac{1}{7} sin (7 x) - \int e^{x} \frac{1}{7} sin (7 x) d x

Take the constant out:

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

= e^{x} \frac{1}{7} sin (7 x) - \frac{1}{7} \cdot \int e^{x} sin (7 x) d x

Apply Integration By Parts

= e^{x} \frac{1}{7} sin (7 x) - \frac{1}{7} (- \frac{1}{7} e^{x} cos (7 x) - \int - \frac{1}{7} e^{x} cos (7 x) d x)

Take the constant out:

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

= e^{x} \frac{1}{7} sin (7 x) - \frac{1}{7} (- \frac{1}{7} e^{x} cos (7 x) - (- \frac{1}{7} \cdot \int e^{x} cos (7 x) d x))

Therefore

\int e^{x} cos (7 x) d x = e^{x} \frac{1}{7} sin (7 x) - \frac{1}{7} (- \frac{1}{7} e^{x} cos (7 x) - (- \frac{1}{7} \cdot \int e^{x} cos (7 x) d x))

Isolate

\int e^{x} cos (7 x) d x

= \frac{7 e ^{x} sin ( 7 x )}{50} + \frac{e ^{x} cos ( 7 x )}{50}

Add a constant to the solution

= \frac{7 e ^{x} sin ( 7 x )}{50} + \frac{e ^{x} cos ( 7 x )}{50} + C

What is the integral of e^xcos(7x) ?
The integral of e^xcos(7x) is (7e^xsin(7x))/(50)+(e^xcos(7x))/(50)+C