MCQ
જો $\cos (A + B) = \alpha \cos A\cos B + \beta \sin A\sin B,$ તો $(\alpha ,\beta ) =$
- A$(-1, -1)$
- B$(-1, 1)$
- ✓$(1, -1)$
- D$(1, 1)$
But $\cos \,(A + B) = \cos \,A\,\cos B - \sin A\,\sin \,B$
$ \Rightarrow \,\,\alpha = 1,\,\,\beta = - 1.$
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