trigonometry

Related Questions

• If $\cos A=\cos B\,\,\cos C$and $A+B+C=\pi ,$ then the value of $\cot \,B\,\cot \,C$ is

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• If $\sin A+\sin B=C,\cos A+\cos B=D,$then the value of $\sin (A+B)=$

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• If $\tan \beta =\cos \theta \tan \alpha ,$then ${{\tan }^{2}}\frac{\theta }{2}=$

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• If cot $(\alpha +\beta )=0,$then $\sin (\alpha +2\beta )=$

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• The period of ${{\sin }^{4}}x+{{\cos }^{4}}x$ is

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