What is the integral from 0 to pi of cos(kx) ?

The integral from 0 to pi of cos(kx) is 0

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integral from 0 to pi of cos(kx)

\int_{0}^{π} cos (k x) d x

0

Solution steps

\int_{0}^{π} cos (k x) d x

Apply u-substitution

: \int_{0}^{kπ} \frac{cos ( u )}{k} d u

= \int_{0}^{kπ} \frac{cos ( u )}{k} d u

Take the constant out:

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

= \frac{1}{k} \cdot \int_{0}^{kπ} cos (u) d u

Use the common integral:

\int cos (u) d u = sin (u)

= \frac{1}{k} [sin (u)]_{0}^{kπ}

Compute the boundaries:

0

= \frac{1}{k} \cdot 0

Simplify

= 0

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What is the integral from 0 to pi of cos(kx) ?
The integral from 0 to pi of cos(kx) is 0