What is the integral of cos(30x)sin(20x) ?

The integral of cos(30x)sin(20x) is 1/2 (-1/50 cos(50x)+1/10 cos(10x))+C

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integral of cos(30x)sin(20x)

\int cos (30 x) sin (20 x) d x

\frac{1}{2} (- \frac{1}{50} cos (50 x) + \frac{1}{10} cos (10 x)) + C

Solution steps

\int cos (30 x) sin (20 x) d x

Use the following identity:

cos (t) sin (s) = \frac{sin ( s + t ) + sin ( s - t )}{2}

= \int \frac{sin ( 20 x + 30 x ) + sin ( 20 x - 30 x )}{2} d x

Take the constant out:

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

= \frac{1}{2} \cdot \int sin (20 x + 30 x) + sin (20 x - 30 x) d x

Apply the Sum Rule:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= \frac{1}{2} (\int sin (20 x + 30 x) d x + \int sin (20 x - 30 x) d x)

\int sin (20 x + 30 x) d x = - \frac{1}{50} cos (50 x)

\int sin (20 x - 30 x) d x = \frac{1}{10} cos (10 x)

= \frac{1}{2} (- \frac{1}{50} cos (50 x) + \frac{1}{10} cos (10 x))

Add a constant to the solution

= \frac{1}{2} (- \frac{1}{50} cos (50 x) + \frac{1}{10} cos (10 x)) + C

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What is the integral of cos(30x)sin(20x) ?
The integral of cos(30x)sin(20x) is 1/2 (-1/50 cos(50x)+1/10 cos(10x))+C