trigonometry

Related Questions

• If $x+\frac{1}{x}=2\cos \alpha $, then ${{x}^{n}}+\frac{1}{{{x}^{n}}}=$

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• If $\theta $and $\varphi $are angles in the 1st quadrant such that $\tan \theta =1/7$and $\sin \varphi =1/\sqrt{10}$.Then

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• $\cos A+\sin (270{}^\circ +A)-\sin (270{}^\circ -A)+\cos (180{}^\circ +A)=$

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• Two pillars of equal height stand on either side of a roadway which is 60 metres wide. At a point in the roadway between the pillars, the elevation of the top of pillars are 60° and 30°. The height of the pillars is

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• If $\cos 2\theta +3\cos \theta =0$, then the general value of $\theta $ is

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