trigonometry

Related Questions

• A, B, C are the angles of a triangle, then ${{\sin }^{2}}A+{{\sin }^{2}}B+{{\sin }^{2}}C-2\cos A\,\cos B\,\cos C=$

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• The value of $\cos 12{}^\circ +\cos 84{}^\circ +\cos 156{}^\circ +\cos 132{}^\circ $ is

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

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• In a triangle $ABC$ , $AD$ is altitude from A. Given $b>c,$ $\angle C={{23}^{o}}$ and $AD=\frac{abc}{{{b}^{2}}-{{c}^{2}}},$ then $\angle B=$

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• If $\sin \theta +\text{cosec}\theta =\text{2}$, then ${{\sin }^{2}}\theta +\text{cose}{{\text{c}}^{\text{2}}}\theta =$

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