Question: What happens if you take B = A in the trigonometric identity cos (A - B) = cos Acos B + sin Asin B? Does
What happens if you take B = A in the trigonometric identity cos (A - B) = cos Acos B + sin Asin B? Does the result agree with something you already know?
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If we take B A in the trigonometric identity cos A B cos A cos B sin A sin B we get cos A A ... View full answer
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