If A = B = 60°. Verify the Cos (A – B) = Cos A cos B + sin A sin B

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asked Feb 15, 2018 in Mathematics by sforrest072 (157,439 points) 61 411 949
If A = B = 60°. Verify the

Cos (A – B) = Cos A cos B + sin A sin B

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answered Feb 15, 2018 by mdsamim (213,225 points) 5 10 15
selected Feb 15, 2018 by sforrest072
 
Best answer

The correct answer is

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