Categories > trigonometry > Fundamental trigonometrical ratios and functions > If $\alpha =22{}^\circ 30',$then $(1+\cos \alpha )(1+\cos 3\alpha )$ $(1+\cos 5\alpha )(1+\cos 7\alpha )$ equals

trigonometry

Question: If $\alpha =22{}^\circ 30',$then $(1+\cos \alpha )(1+\cos 3\alpha )$ $(1+\cos 5\alpha )(1+\cos 7\alpha )$ equals


1) 1/8
2) 1/4
3) $\frac{1+\sqrt{2}}{2\sqrt{2}}$
4) $\frac{\sqrt{2}-1}{\sqrt{2}+1}$
Solution: Explanation: No Solution
Fundamental trigonometrical ratios and functions Trigonometrical ratio of allied angles

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