A) \[\cos (A+B)=cosA+\operatorname{cosB}\]
B) \[\cos (A+B)=cosA\operatorname{cosB}\]
C) \[\cos (A+B)=cosA\operatorname{cosB}-\sin A\sin B\]
D) \[\cos (A+B)=cosA\operatorname{cosB}+\sin A\sin B\]
Correct Answer: C
Solution :
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