What is the integral of 4sin^3(2x) ?

The integral of 4sin^3(2x) is 32(-1/4 cos^4(x)+1/6 cos^6(x))+C

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integral of 4sin^3(2x)

\int 4 sin^{3} (2 x) d x

32 (- \frac{1}{4} cos^{4} (x) + \frac{1}{6} cos^{6} (x)) + C

Solution steps

\int 4 sin^{3} (2 x) d x

Take the constant out:

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

= 4 \cdot \int sin^{3} (2 x) d x

Rewrite using trig identities

= 4 \cdot \int 8 cos^{3} (x) sin^{3} (x) d x

Take the constant out:

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

= 4 \cdot 8 \cdot \int cos^{3} (x) sin^{3} (x) d x

Rewrite using trig identities

= 4 \cdot 8 \cdot \int (1 - cos^{2} (x)) sin (x) cos^{3} (x) d x

Apply u-substitution

: \int - u^{3} (1 - u^{2}) d u

= 4 \cdot 8 \cdot \int - u^{3} (1 - u^{2}) d u

Expand

- u^{3} (1 - u^{2}) : - u^{3} + u^{5}

= 4 \cdot 8 \cdot \int - u^{3} + u^{5} d u

Apply the Sum Rule:

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

= 4 \cdot 8 (- \int u^{3} d u + \int u^{5} d u)

\int u^{3} d u = \frac{u ^{4}}{4}

\int u^{5} d u = \frac{u ^{6}}{6}

= 4 \cdot 8 (- \frac{u ^{4}}{4} + \frac{u ^{6}}{6})

Substitute back

u = cos (x)

= 4 \cdot 8 (- \frac{cos ^{4} ( x )}{4} + \frac{cos ^{6} ( x )}{6})

Simplify

4 \cdot 8 (- \frac{cos ^{4} ( x )}{4} + \frac{cos ^{6} ( x )}{6}) : 32 (- \frac{1}{4} cos^{4} (x) + \frac{1}{6} cos^{6} (x))

= 32 (- \frac{1}{4} cos^{4} (x) + \frac{1}{6} cos^{6} (x))

Add a constant to the solution

= 32 (- \frac{1}{4} cos^{4} (x) + \frac{1}{6} cos^{6} (x)) + C

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What is the integral of 4sin^3(2x) ?
The integral of 4sin^3(2x) is 32(-1/4 cos^4(x)+1/6 cos^6(x))+C