trigonometry

Related Questions

• ${{\cos }^{2}}\left( \frac{\pi }{6}+\theta \right)-{{\sin }^{2}}\left( \frac{\pi }{6}-\theta \right)=$

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• If in a triangle the angles are in A. P. and $b:c=\sqrt{3}:\sqrt{2}$ , then $\angle A$ is equal to

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• $\cot (45{}^\circ +\theta )\cot (45{}^\circ -\theta )=$

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• If $\alpha +\beta -\gamma =\pi ,$then${{\sin }^{2}}\alpha +{{\sin }^{2}}\beta -{{\sin }^{2}}\gamma =$

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• If the angles of elevation of two towers from the middle point of the line joining their feet be 60° and 30° respectively, then the ratio of their heights is

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