trigonometry

Related Questions

• The equation $\sin x+\sin y+\sin z=-3$ for $0\le x\le 2\pi ,$ $0\le y\le 2\pi ,$ $0\le z\le 2\pi $, has

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• If $\cos \theta =\frac{8}{17}$ and $\theta $ lies in the 1st quadrant, then the value of $\cos (30{}^\circ +\theta )+\cos (45{}^\circ -\theta )+\cos (120{}^\circ -\theta )$ is

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• If in the $\Delta ABC,AB=2BC$ , then $\tan \frac{B}{2}:\cot \left( \frac{C-A}{2} \right)$

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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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• $\tan \frac{A}{2}$is equal to

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