trigonometry

Related Questions

• The period of ${{\sin }^{4}}x+{{\cos }^{4}}x$ is

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• If $(1+\tan \theta )(1+\tan \varphi )=2$, then $\theta +\varphi $=

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• If $\tan A-\tan B=x$ and $\cot B-\cot A=y,$then $\cot (A-B)=$

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• If $x=\cos 10{}^\circ \cos 20{}^\circ \cos 40{}^\circ ,$then the value of $x$ is

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• If $A+B+C={{180}^{o}},$then $\sum{\tan \frac{A}{2}\tan \frac{B}{2}=}$

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