trigonometry

Related Questions

• If $\cos x+{{\cos }^{2}}x=1,$then the value of ${{\sin }^{2}}x+{{\sin }^{4}}x$ is

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• If $\cos (\theta -\alpha ),\ \cos \theta $and $\cos (\theta +\alpha )$are in H.P., then $\cos \theta \sec \frac{\alpha }{2}$is equal to

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• If $\cos 2B=\frac{\cos (A+C)}{\cos (A-C)}$, then $\tan A,\ \tan B,\ \tan C$ are in

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• In a triangle $ABC$ , if $a=2,B={{60}^{o}}$ and $C={{75}^{o}}$ , then $b =$

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• In$\Delta ABC,$ if $\cos A+\cos C=4{{\sin }^{2}}\frac{1}{2}B,$ then $a,b,c$ are in

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