trigonometry

Related Questions

• $\cos \frac{2\pi }{15}\cos \frac{4\pi }{15}\cos \frac{8\pi }{15}\cos \frac{16\pi }{15}$ =

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• The angle of elevation of a cliff at a point A on the ground and a point B, 100 m vertically at A are $\alpha$ and $\beta$ respectively. The height of the cliff is

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• $2{{\cos }^{2}}\theta -2{{\sin }^{2}}\theta =1$,then $\theta =$

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• If $2{{\cos }^{2}}x+3\sin x-3=0,\,\,0\le x\le {{180}^{o}}$, then $x =$

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• If $\cos (\alpha -\beta )=1$ and $\cos (\alpha +\beta )=\frac{1}{e}$, $-\pi <\alpha ,\beta <\pi $, then total number of ordered pair of $(\alpha ,\beta )$ is

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