What is the integral of cos^5(3x)sin^4(3x) ?

The integral of cos^5(3x)sin^4(3x) is 1/3 ((sin^5(3x))/5-(2sin^7(3x))/7+(sin^9(3x))/9)+C

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integral of cos^5(3x)sin^4(3x)

\int cos^{5} (3 x) sin^{4} (3 x) d x

\frac{1}{3} (\frac{sin ^{5} ( 3 x )}{5} - \frac{2 sin ^{7} ( 3 x )}{7} + \frac{sin ^{9} ( 3 x )}{9}) + C

Solution steps

\int cos^{5} (3 x) sin^{4} (3 x) d x

Apply u-substitution

: \int cos^{5} (u) sin^{4} (u) \frac{1}{3} d u

= \int cos^{5} (u) sin^{4} (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 cos^{5} (u) sin^{4} (u) d u

Rewrite using trig identities

= \frac{1}{3} \cdot \int (1 - sin^{2} (u))^{2} cos (u) sin^{4} (u) d u

Apply u-substitution

: \int v^{4} (1 - v^{2})^{2} d v

= \frac{1}{3} \cdot \int v^{4} (1 - v^{2})^{2} d v

Expand

v^{4} (1 - v^{2})^{2} : v^{4} - 2 v^{6} + v^{8}

= \frac{1}{3} \cdot \int v^{4} - 2 v^{6} + v^{8} d v

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}{3} (\int v^{4} d v - \int 2 v^{6} d v + \int v^{8} d v)

\int v^{4} d v = \frac{v ^{5}}{5}

\int 2 v^{6} d v = \frac{2 v ^{7}}{7}

\int v^{8} d v = \frac{v ^{9}}{9}

= \frac{1}{3} (\frac{v ^{5}}{5} - \frac{2 v ^{7}}{7} + \frac{v ^{9}}{9})

Substitute back

= \frac{1}{3} (\frac{sin ^{5} ( 3 x )}{5} - \frac{2 sin ^{7} ( 3 x )}{7} + \frac{sin ^{9} ( 3 x )}{9})

Add a constant to the solution

= \frac{1}{3} (\frac{sin ^{5} ( 3 x )}{5} - \frac{2 sin ^{7} ( 3 x )}{7} + \frac{sin ^{9} ( 3 x )}{9}) + C

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What is the integral of cos^5(3x)sin^4(3x) ?
The integral of cos^5(3x)sin^4(3x) is 1/3 ((sin^5(3x))/5-(2sin^7(3x))/7+(sin^9(3x))/9)+C