What is the integral of cos^{18}(θ)sin(θ) ?

The integral of cos^{18}(θ)sin(θ) is -(cos^{19}(θ))/(19)+C

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integral of cos^{18}(θ)sin(θ)

\int cos^{18} (θ) sin (θ) d θ

- \frac{cos ^{19} ( θ )}{19} + C

Solution steps

\int cos^{18} (θ) sin (θ) d θ

Apply u-substitution

: \int - u^{18} d u

= \int - u^{18} d u

Take the constant out:

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

= - \int u^{18} d u

Apply the Power Rule

: \frac{u ^{19}}{19}

= - \frac{u ^{19}}{19}

Substitute back

u = cos (θ)

= - \frac{cos ^{19} ( θ )}{19}

Add a constant to the solution

= - \frac{cos ^{19} ( θ )}{19} + C

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What is the integral of cos^{18}(θ)sin(θ) ?
The integral of cos^{18}(θ)sin(θ) is -(cos^{19}(θ))/(19)+C