What is the integral from-pi/2 to pi/2 of cos(2θ) ?

The integral from-pi/2 to pi/2 of cos(2θ) is 0

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integral from-pi/2 to pi/2 of cos(2θ)

\int_{- \frac{π}{2}}^{\frac{π}{2}} cos (2 θ) d θ

0

Solution steps

\int_{- \frac{π}{2}}^{\frac{π}{2}} cos (2 θ) d θ

Apply u-substitution

= \int_{- π}^{π} cos (u) \frac{1}{2} d u

Take the constant out:

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

= \frac{1}{2} \cdot \int_{- π}^{π} cos (u) d u

Use the common integral:

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

= \frac{1}{2} [sin (u)]_{- π}^{π}

Compute the boundaries:

0

= \frac{1}{2} \cdot 0

Simplify

= 0

What is the integral from-pi/2 to pi/2 of cos(2θ) ?
The integral from-pi/2 to pi/2 of cos(2θ) is 0