trigonometry

Related Questions

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

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• If A, B, C, D are the angles of a cyclic quadrilateral, then $\cos \,A+\cos B+\cos \,\,C+\cos D=$

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• If $\tan \frac{B-C}{2}=x\cot \frac{A}{2},$ then $x=$

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• The value of $\frac{\tan {{70}^{o}}-\tan {{20}^{o}}}{\tan {{50}^{o}}}=$

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• The radius of the incircle of triangle when sides are 18, 24 and 30 cms is

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