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Question Number 133950 by liberty last updated on 25/Feb/21

$$\mathrm{Find}\mathrm{the}\mathrm{value}\mathrm{of}$$$$\sin {}^2\left(\frac{9\pi }{10}\right).\sin {}^2\left(\frac{7\pi }{10}\right).$$

Answered by bobhans last updated on 25/Feb/21

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