What is the integral from-1 to 1 of cos(pix) ?

The integral from-1 to 1 of cos(pix) is 0

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integral from-1 to 1 of cos(pix)

\int_{- 1}^{1} cos (π x) d x

0

Solution steps

\int_{- 1}^{1} cos (π x) d x

Apply u-substitution

: \int_{- π}^{π} cos (u) \frac{1}{π} d u

= \int_{- π}^{π} cos (u) \frac{1}{π} d u

Take the constant out:

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

= \frac{1}{π} \cdot \int_{- π}^{π} cos (u) d u

Use the common integral:

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

= \frac{1}{π} [sin (u)]_{- π}^{π}

Compute the boundaries:

0

= \frac{1}{π} \cdot 0

Simplify

= 0

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What is the integral from-1 to 1 of cos(pix) ?
The integral from-1 to 1 of cos(pix) is 0