Different methods, different answers. – math.stackexchange.com

If $\int_{\pi/2}^\theta\sin x\,dx=\sin2\theta$, then the value of $\theta$ satisfying $0<\theta<\pi$, is (a) $3\pi/2$ (b) $\pi/6$ (c) $5\pi/6$ (d) $\pi/2$ Method 1: I apply Leibniz ...

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