trigonometry

Related Questions

• If $A+B+C=\pi ,$ then $\frac{\cos A}{\sin B\sin C}+\frac{\cos B}{\sin C\sin A}+\frac{\cos C}{\sin A\sin B}=$

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• In $\Delta ABC$ , if $\tan \frac{A}{2}\tan \frac{C}{2}=\frac{1}{2},$ then $a,b,c$ are in

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• If in $\Delta \,ABC$ , $2{{b}^{2}}={{a}^{2}}+{{c}^{2}},$ then $\frac{\sin 3B}{\sin B}=$

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• In a triangle ABC, ${{a}^{3}}\cos (B-C)+{{b}^{3}}\cos (C-A)+{{c}^{3}}\cos (A-B)=$

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• $\tan A+\cot (180{}^\circ +A)+\cot (90{}^\circ +A)+\cot (360{}^\circ -A)$

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