What is the integral from 0 to pi of x^2cos(n)x ?

The integral from 0 to pi of x^2cos(n)x is cos(n)(pi^4)/4

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integral from 0 to pi of x^2cos(n)x

\int_{0}^{π} x^{2} cos (n) x d x

cos (n) \frac{π ^{4}}{4}

Solution steps

\int_{0}^{π} x^{2} cos (n) x d x

Take the constant out:

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

= cos (n) \cdot \int_{0}^{π} x^{2} x d x

Simplify

x^{2} x : x^{3}

= cos (n) \cdot \int_{0}^{π} x^{3} d x

Apply the Power Rule

: [\frac{x ^{4}}{4}]_{0}^{π}

= cos (n) [\frac{x ^{4}}{4}]_{0}^{π}

Compute the boundaries:

\frac{π ^{4}}{4}

= cos (n) \frac{π ^{4}}{4}

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What is the integral from 0 to pi of x^2cos(n)x ?
The integral from 0 to pi of x^2cos(n)x is cos(n)(pi^4)/4