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

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

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

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

3 (- \frac{cos ^{5} ( \frac{x}{3} )}{5} + \frac{cos ^{7} ( \frac{x}{3} )}{7}) + C

Solution steps

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

Apply u-substitution

: \int cos^{4} (u) sin^{3} (u) \cdot 3 d u

= \int cos^{4} (u) sin^{3} (u) \cdot 3 d u

Take the constant out:

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

= 3 \cdot \int cos^{4} (u) sin^{3} (u) d u

Rewrite using trig identities

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

Apply u-substitution

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

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

Expand

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

= 3 \cdot \int - v^{4} + v^{6} 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

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

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

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

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

Substitute back

= 3 (- \frac{cos ^{5} ( \frac{x}{3} )}{5} + \frac{cos ^{7} ( \frac{x}{3} )}{7})

Add a constant to the solution

= 3 (- \frac{cos ^{5} ( \frac{x}{3} )}{5} + \frac{cos ^{7} ( \frac{x}{3} )}{7}) + C

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