trigonometry

Related Questions

• In $\Delta ABC,\frac{\sin B}{\sin (A+B)}=$

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• $\sin {{163}^{o}}\cos {{347}^{o}}+\sin {{73}^{o}}\sin {{167}^{o}}=$

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• .Given that $\cos \left( \frac{\alpha -\beta }{2} \right)=2\cos \left( \frac{\alpha +B}{2} \right)$, then $\tan \frac{\alpha }{2}\tan \frac{\beta }{2}$is equal to

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• If in $\Delta \,ABC$ , $2{{b}^{2}}={{a}^{2}}+{{c}^{2}},$ then $\frac{\sin 3B}{\sin B}=$

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• The angle of elevation of the top of the tower observed from each of the three points $A,B,C$on the ground, forming a triangle is the same angle $\alpha $. If R is the circum-radius of the triangle ABC, then the height of the tower is

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