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OpenStudy (anonymous):
The expression cos 4x cos 3x + sin 4x sin 3x is equivalent to
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OpenStudy (zzr0ck3r):
cos(a-b)=cos(a)cos(b)+sin(a)sin(b)
OpenStudy (zzr0ck3r):
you have a = 4x and b = 3x
OpenStudy (zzr0ck3r):
note the order does not matter because cos(-x) = cos(x)
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