trigonometry

Related Questions

• If $y=x\tan \frac{\alpha +\beta }{2}$ , then $\tan A+\tan B+\tan C=$

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• If $\tan \alpha $ equals the integral solution of the inequality $4{{x}^{2}}-16x+15<0$ and $\cos \beta $ equals to the slope of the bisector of first quadrant, then $\sin (\alpha +\beta )\sin (\alpha -\beta )$is equal to

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• $\frac{\sin 3\theta -\cos 3\theta }{\sin \theta +\cos \theta }+1=$

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• Which is true in the following

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• If $\sin A=\frac{4}{5}$and $\cos B=-\frac{12}{13},$where A and B lie in first and third quadrant respectively, then $\cos (A+B)=$

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