What is the integral of sin(3x)sin(cos(3x)) ?

The integral of sin(3x)sin(cos(3x)) is 1/3 cos(cos(3x))+C

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integral of sin(3x)sin(cos(3x))

\int sin (3 x) sin (cos (3 x)) d x

\frac{1}{3} cos (cos (3 x)) + C

Solution steps

\int sin (3 x) sin (cos (3 x)) d x

Apply u-substitution

: \int sin (u) sin (cos (u)) \frac{1}{3} d u

= \int sin (u) sin (cos (u)) \frac{1}{3} d u

Take the constant out:

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

= \frac{1}{3} \cdot \int sin (u) sin (cos (u)) d u

Apply u-substitution

: \int - sin (v) d v

= \frac{1}{3} \cdot \int - sin (v) d v

Take the constant out:

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

= \frac{1}{3} (- \int sin (v) d v)

Use the common integral:

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

= \frac{1}{3} (- (- cos (v)))

Substitute back

= \frac{1}{3} (- (- cos (cos (3 x))))

Simplify

= \frac{1}{3} cos (cos (3 x))

Add a constant to the solution

= \frac{1}{3} cos (cos (3 x)) + C

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What is the integral of sin(3x)sin(cos(3x)) ?
The integral of sin(3x)sin(cos(3x)) is 1/3 cos(cos(3x))+C