trigonometry

Related Questions

• If $\cos (A+B)=\alpha \cos A\cos B+\beta \sin A\sin B,$then $(\alpha ,\beta )$=

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• The maximum value of the function $f(x)=3\sin x+4\cos x$ is

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• If $\sin 2\theta +\sin 2\varphi =1/2$ and $\cos 2\theta +\cos 2\varphi =3/2$, then ${{\cos }^{2}}(\theta -\varphi )=$

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• If in a triangle ABC the sides $AB$ and AC are perpendicular, then the true equation 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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