Class 11MathematicsTrigonometric FunctionsTrigonometrical ratios of sum and difference of two and three angles
EasyIf $\cos (A + B) = \alpha \cos A \cos B + \beta \sin A \sin B,$ then $(\alpha, \beta) =$
- A$(-1, -1)$
- B$(-1, 1)$
- C$(1, -1)$
- D$(1, 1)$
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MediumIIT 1979
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