trigonometry

Related Questions

• In $\Delta \,ABC$ , $\frac{\cos \frac{1}{2}(B-C)}{\sin \frac{1}{2}A}=$

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• $\cot \frac{A+B}{2}$. $\tan \frac{A-B}{2}=$

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• The period of $f(x)=\sin \left( \frac{\pi x}{n-1} \right)+\cos \,\left( \frac{\pi x}{n} \right)\,\,,\,n\in Z$ , $n>2$ is

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• If $\pi <\alpha <\frac{3\pi }{2}$, then $\sqrt{\frac{1-\cos \alpha }{1+\cos \alpha }}+\sqrt{\frac{1+\cos \alpha }{1-\cos \alpha }}$=

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• In a triangle $ABC$ if $2{{a}^{2}}{{b}^{2}}+2{{b}^{2}}{{c}^{2}}=$ ${{a}^{4}}+{{b}^{4}}+{{c}^{4}}$ , then angle B is equal to

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