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OpenStudy (anonymous):
I need help quick with this trig question!!! For all real numbers x, cos(75x) cos(73x) + sin(75x) sin (73x) A) cos (2x) B) all answers listed C) 2 cos^2x - sin^2x D)cos^2x-sin^2x E) 1-2sin^2x
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OpenStudy (anonymous):
cos(A - B) = cos(A)cos(B) + sin(A)sin(B). So your answer is A.
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