trigonometry

Question: If $\cos (A+B)=\alpha \cos A\cos B+\beta \sin A\sin B,$then $(\alpha ,\beta )$=



1) (– 1, – 1)
2) (– 1, 1)
3) (1, – 1)
4) (1, 1)
Solution: Explanation: No Solution
Trigonometric ratios of sum and difference of two and three

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