trigonometry

Related Questions

• The value of $\cos y\cos \left( \frac{\pi }{2}-x \right)-\cos \left( \frac{\pi }{2}-y \right)\cos x$ $+\sin y\cos \left( \frac{\pi }{2}-x \right)+\cos x\sin \left( \frac{\pi }{2}-y \right)$ is zero, if

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• The angle of elevation of the top of a tower from a point A due south of the tower is $\alpha $and from a point B due east of the tower is $\beta $. If $AB =d$, then the height of the tower is

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• General solution of the equation $\cot \theta -\tan \theta =2$is

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• The equation $3\cos x+4\sin x=6$has

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• The value of $\tan (-945{}^\circ )$ is

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