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OpenStudy (anonymous):
cos(5x/2)+cos(7x/2) = ? as a product of sines and/or cosines
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OpenStudy (lochana):
Do you know about something called C,D fomulars in trig?
OpenStudy (lochana):
Use this one. CosC + CosD = 2Cos[(C+D)/2]Cos[(C-D)/2] now do these substitutions C = 5x/2; D=7x/2
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