The area bonded by the curve $y=\sin ^{2} x, x$ -axis and the lines $x=0$ and $x=\frac{\pi}{2}$ is

The area bonded by the curve $y=\sin ^{2} x, x$ -axis and the lines $x=0$ and $x=\frac{\pi}{2}$ is
  1. 1 sq. units
  2. $\frac{\pi}{8}$ sq. units
  3. $\frac{\pi}{4}$ sq. units
  4. $\frac{\pi}{2}$ sq. units

Solution

Required area is shaded. $\begin{aligned} A &=\int_{0}^{\pi / 2} \sin ^{2} x d x \\ &=\int_{0}^{\pi / 2} \frac{1-\cos 2 x}{2} d x \\ &=\frac{1}{2}[x]_{0}^{\frac{\pi}{2}}-\frac{1}{4}[\sin 2 x]_{0}^{\frac{\pi}{2}} \\ &=\frac{\pi}{4}-0=\frac{\pi}{4} \end{aligned}$

Asked in: MHT CET 2020 (20 Oct Shift 2)

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