What is the integral of sin(8x)cos(7x) ?

The integral of sin(8x)cos(7x) is 1/2 (-1/15 cos(15x)-cos(x))+C

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integral of sin(8x)cos(7x)

\int sin (8 x) cos (7 x) d x

\frac{1}{2} (- \frac{1}{15} cos (15 x) - cos (x)) + C

Solution steps

\int sin (8 x) cos (7 x) d x

Use the following identity:

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

= \int \frac{sin ( 8 x + 7 x ) + sin ( 8 x - 7 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 (8 x + 7 x) + sin (8 x - 7 x) d x

Simplify

= \frac{1}{2} \cdot \int sin (15 x) + sin (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 (15 x) d x + \int sin (x) d x)

\int sin (15 x) d x = - \frac{1}{15} cos (15 x)

\int sin (x) d x = - cos (x)

= \frac{1}{2} (- \frac{1}{15} cos (15 x) - cos (x))

Add a constant to the solution

= \frac{1}{2} (- \frac{1}{15} cos (15 x) - cos (x)) + C

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What is the integral of sin(8x)cos(7x) ?
The integral of sin(8x)cos(7x) is 1/2 (-1/15 cos(15x)-cos(x))+C