trigonometry

Related Questions

• If $A+B+C={{180}^{o}},$ then $\frac{\sin 2A+\sin 2B+\sin 2C}{\cos A+\cos B+\cos C-1}=$

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• The angle of elevation of a stationary cloud from a point 2500 m above a lake is 15° and the angle of depression of its reflection in the lake is 45°. The height of cloud above the lake level is

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• In a $\Delta ABC,\ {{r}_{1}} < {{r}_{2}} < {{r}_{3}},$then

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• The expression ${{\cos }^{2}}(A-B)+{{\cos }^{2}}B-2\cos (A-B)\cos A\cos B$ is

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• If n is any integer, then the general solution of the equation $\cos x-\sin x=\frac{1}{\sqrt{2}}$ is

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