trigonometry

Question: If $\cos 3\theta =\alpha \cos \theta +\beta {{\cos }^{3}}\theta ,$then $(\alpha ,\beta )=$



1) $(3,\,4)$
2) $(4,\,3)$
3) $(-3,\,4)$
4) $(3,\,-4)$
Solution: Explanation: No Solution
Trigonometric ratios of multiple and sub-multiple angles

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