What is the integral of 9xcos^2(x) ?

The integral of 9xcos^2(x) is 9(1/2 x(x+1/2 sin(2x))-1/2 ((x^2)/2-1/4 cos(2x)))+C

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integral of 9xcos^2(x)

\int 9 x cos^{2} (x) d x

9 (\frac{1}{2} x (x + \frac{1}{2} sin (2 x)) - \frac{1}{2} (\frac{x ^{2}}{2} - \frac{1}{4} cos (2 x))) + C

Solution steps

\int 9 x cos^{2} (x) d x

Take the constant out:

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

= 9 \cdot \int x cos^{2} (x) d x

Apply Integration By Parts

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

= 9 (\frac{1}{2} x (x + \frac{1}{2} sin (2 x)) - \int \frac{1}{2} (x + \frac{1}{2} sin (2 x)) d x)

\int \frac{1}{2} (x + \frac{1}{2} sin (2 x)) d x = \frac{1}{2} (\frac{x ^{2}}{2} - \frac{1}{4} cos (2 x))

= 9 (\frac{1}{2} x (x + \frac{1}{2} sin (2 x)) - \frac{1}{2} (\frac{x ^{2}}{2} - \frac{1}{4} cos (2 x)))

Add a constant to the solution

= 9 (\frac{1}{2} x (x + \frac{1}{2} sin (2 x)) - \frac{1}{2} (\frac{x ^{2}}{2} - \frac{1}{4} cos (2 x))) + C

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What is the integral of 9xcos^2(x) ?
The integral of 9xcos^2(x) is 9(1/2 x(x+1/2 sin(2x))-1/2 ((x^2)/2-1/4 cos(2x)))+C