trigonometry

Related Questions

• $\cos 1{}^\circ .\cos 2{}^\circ .\cos 3{}^\circ .........\cos 179{}^\circ =$

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• $\tan A+\cot (180{}^\circ +A)+\cot (90{}^\circ +A)+\cot (360{}^\circ -A)$

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• If $\pi <\alpha <\frac{3\pi }{2}$, then $\sqrt{\frac{1-\cos \alpha }{1+\cos \alpha }}+\sqrt{\frac{1+\cos \alpha }{1-\cos \alpha }}$=

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• The minimum value of $9{{\tan }^{2}}\theta +4{{\cot }^{2}}\theta $is

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• In $\Delta ABC$ , $\frac{\cos A}{a}+\frac{\cos B}{b}+\frac{\cos C}{c}=$

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