Categories > trigonometry > Fundamental trigonometrical ratios and functions > If $\cos \theta =\frac{1}{2}\left( x+\frac{1}{x} \right)$, then $\frac{1}{2}\left( {{x}^{2}}+\frac{1}{{{x}^{2}}} \right)=$

trigonometry

Question: If $\cos \theta =\frac{1}{2}\left( x+\frac{1}{x} \right)$, then $\frac{1}{2}\left( {{x}^{2}}+\frac{1}{{{x}^{2}}} \right)=$


1) $\sin 2\theta $
2) $\cos \,2\theta $
3) $\tan \,2\theta $
4) $\sec \,2\theta $
Solution: Explanation: No Solution
Fundamental trigonometrical ratios and functions Trigonometrical ratio of allied angles

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