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

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

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integral of cos^3(x)

integral

cos^{3} (x)

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

Solution steps

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

Rewrite using trig identities

= \int (1 - sin^{2} (x)) cos (x) d x

Apply u-substitution

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

= \int 1 - u^{2} 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

= \int 1 d u - \int u^{2} d u

\int 1 d u = u

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

= u - \frac{u ^{3}}{3}

Substitute back

u = sin (x)

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

Add a constant to the solution

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

\int (t er m o, i) d x

\int \frac{ln ^{4} ( x )}{x} d x

\int \frac{x ^{3} - 2 x ^{2} + x + 1}{x ^{4} + 5 x ^{2} + 4} d x

\int \frac{4 sin ( x )}{x} d x

\int - 3 x^{2} + \frac{1}{x} d x

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