Aspire Faculty ID #13615 · Topic: JAMIA MILLIA ISLAMIA MCA 2023 · Just now
JAMIA MILLIA ISLAMIA MCA 2023

The value of $\sin\dfrac{\pi}{16} \sin\dfrac{3\pi}{16} \sin\dfrac{5\pi}{16} \sin\dfrac{7\pi}{16}$ is —

Solution

We know that $\sin x \sin\!\left(\dfrac{\pi}{4} - x\right) \sin\!\left(\dfrac{\pi}{4} + x\right) = \dfrac{1}{4}\sin(4x).$ Let $x = \dfrac{\pi}{16}$. Then, $\sin\dfrac{\pi}{16} \sin\dfrac{3\pi}{16} \sin\dfrac{5\pi}{16} \sin\dfrac{7\pi}{16} = \dfrac{\sqrt{2}}{32}.$

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