trigonometry

Related Questions

• If $\cos 3x+\sin \left( 2x-\frac{7\pi }{6} \right)=-2$, then $x=$ (where $k\in Z$)

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• If $\tan \theta +\tan 2\theta +\tan 3\theta =\tan \theta \tan 2\theta \tan 3\theta $, then the general value of $\theta $ is

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• The value of $\cos y\cos \left( \frac{\pi }{2}-x \right)-\cos \left( \frac{\pi }{2}-y \right)\cos x$ $+\sin y\cos \left( \frac{\pi }{2}-x \right)+\cos x\sin \left( \frac{\pi }{2}-y \right)$ is zero, if

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• If $\cos (A+B)=\alpha \cos A\cos B+\beta \sin A\sin B,$then $(\alpha ,\beta )$=

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• In triangle $ABC$ if $a,b,c$ are in A. P., then the value of $\frac{\sin \frac{A}{2}\sin \frac{C}{2}}{\sin \frac{B}{2}}=$

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