What is the integral from 0 to pi/2 of sin^2(y) ?

The integral from 0 to pi/2 of sin^2(y) is pi/4

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integral from 0 to pi/2 of sin^2(y)

\int_{0}^{\frac{π}{2}} sin^{2} (y) d y

\frac{π}{4}

Decimal

0.78539 \dots

Solution steps

\int_{0}^{\frac{π}{2}} sin^{2} (y) d y

Rewrite using trig identities

= \int_{0}^{\frac{π}{2}} \frac{1 - cos ( 2 y )}{2} d y

Take the constant out:

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

= \frac{1}{2} \cdot \int_{0}^{\frac{π}{2}} 1 - cos (2 y) d y

Apply the Sum Rule:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= \frac{1}{2} (\int_{0}^{\frac{π}{2}} 1 d y - \int_{0}^{\frac{π}{2}} cos (2 y) d y)

\int_{0}^{\frac{π}{2}} 1 d y = \frac{π}{2}

\int_{0}^{\frac{π}{2}} cos (2 y) d y = 0

= \frac{1}{2} (\frac{π}{2} - 0)

Simplify

\frac{1}{2} (\frac{π}{2} - 0) : \frac{π}{4}

= \frac{π}{4}

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What is the integral from 0 to pi/2 of sin^2(y) ?
The integral from 0 to pi/2 of sin^2(y) is pi/4