trigonometry

Related Questions

• In $\Delta ABC$ , $(b-c)\cot \frac{A}{2}+(c-a)\cot \frac{B}{2}+(a-b)$ $\cot \frac{C}{2}$ is equal to

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• If in a $\Delta ABC$ , $\cos 3A+\cos 3B+\cos 3C=1$ , then one angle must be exactly equal to

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• In a $\Delta ABC$ , if ${{c}^{2}}+{{a}^{2}}-{{b}^{2}}=ac$ , then $\angle B=$

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• If $\sin 3\alpha =4\sin \alpha \sin (x+\alpha )\sin (x-\alpha ),$then $x=$

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

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