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Question Number 176848 by Ar Brandon last updated on 27/Sep/22

Answered by mr W last updated on 27/Sep/22

$$\beta =\frac{\pi }{2}-\alpha$$$$\cos (\frac{\pi }{2}-2\beta )=\sin 2\beta =\sin (\pi -2\alpha )$$$$=\sin 2\alpha =2\sin \alpha \cos \alpha$$$$=2x\sqrt{1-x^2}$$

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