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

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

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integral from pi/2 to pi of cos(2θ)

\int_{\frac{π}{2}}^{π} cos (2 θ) d θ

0

Solution steps

\int_{\frac{π}{2}}^{π} cos (2 θ) d θ

Apply u-substitution

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

= \int_{π}^{2 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}^{2 π} cos (u) d u

Use the common integral:

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

= \frac{1}{2} [sin (u)]_{π}^{2 π}

Compute the boundaries:

0

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

Simplify

= 0

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