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OpenStudy (anonymous):
Write cos3x cos2y + sin3x sin2y as the cos of an angle.
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OpenStudy (anonymous):
cos(a – b) = cos(a) cos(b) + sin(a) sin(b)
OpenStudy (anonymous):
use this formula
OpenStudy (anonymous):
Oh yeah. CRAP! I knew that -.- Thanks.
OpenStudy (anonymous):
you would think of just a little hh
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