trigonometry

Related Questions

• If $\sin x+\sin y=3(\cos y-\cos x),$ then the value of $\frac{\sin 3x}{\sin 3y}$ is

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• The number of values of $\theta $ in $[0, 2\pi ]$ satisfying the equation $2{{\sin }^{2}}\theta =4+3 \cos \theta $ are

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• An observer on the top of a tree, finds the angle of depression of a car moving towards the tree to be 30°. After 3 minutes this angle becomes 60°. After how much more time, the car will reach the tree

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• If $\tan \theta =\frac{20}{21}$, $\cos \theta$ will be

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• If $A+B+C={{180}^{o}},$ then the value of $\cot \frac{A}{2}+\cot \frac{B}{2}+\cot \frac{C}{2}$ will be

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