What is the integral of cos^3(x/(12)) ?

The integral of cos^3(x/(12)) is 12(sin(x/(12))-(sin^3(x/(12)))/3)+C

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integral of cos^3(x/(12))

\int cos^{3} (\frac{x}{12}) d x

12 (sin (\frac{x}{12}) - \frac{sin ^{3} ( \frac{x}{12} )}{3}) + C

Solution steps

\int cos^{3} (\frac{x}{12}) d x

Apply u-substitution

: \int cos^{3} (u) \cdot 12 d u

= \int cos^{3} (u) \cdot 12 d u

Take the constant out:

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

= 12 \cdot \int cos^{3} (u) d u

Rewrite using trig identities

= 12 \cdot \int (1 - sin^{2} (u)) cos (u) d u

Apply u-substitution

: \int 1 - v^{2} d v

= 12 \cdot \int 1 - v^{2} 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

= 12 (\int 1 d v - \int v^{2} d v)

\int 1 d v = v

\int v^{2} d v = \frac{v ^{3}}{3}

= 12 (v - \frac{v ^{3}}{3})

Substitute back

= 12 (sin (\frac{x}{12}) - \frac{sin ^{3} ( \frac{x}{12} )}{3})

Add a constant to the solution

= 12 (sin (\frac{x}{12}) - \frac{sin ^{3} ( \frac{x}{12} )}{3}) + C

x \to 4 + lim (\frac{x - 4}{x - 4})

2 x^{2} - 9 x + 10

\frac{2}{x - 4}

\int_{0}^{3} 1

\frac{\partial}{\partial z} (x)

What is the integral of cos^3(x/(12)) ?
The integral of cos^3(x/(12)) is 12(sin(x/(12))-(sin^3(x/(12)))/3)+C