What happens if you take B = A in the trigonometric identity cos (A - B) =
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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 the full answer
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Related Book For 
Thomas Calculus Early Transcendentals
ISBN: 9780321884077
13th Edition
Authors: Joel R Hass, Christopher E Heil, Maurice D Weir
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