trigonometry

Related Questions

• In$\Delta ABC,$ if $\cot A,\cot B,\cot C$ be in A. P., then ${{a}^{2}},\text{ }{{b}^{2}},\text{ }{{c}^{2}}$ are in

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• If $\tan A=\frac{1}{2},\tan B=\frac{1}{3},$then $\cos 2A=$

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• If $y=x\tan \frac{\alpha +\beta }{2}$ , then $\tan A+\tan B+\tan C=$

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• If $\sqrt{x}+\frac{1}{\sqrt{x}}=2\cos \theta ,$then ${{x}^{6}}+{{x}^{-6}}=$

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• If $\cos \theta -\sin \theta =\sqrt{2}\sin \theta ,$then $\cos \theta +\sin \theta $is equal to

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