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OpenStudy (anonymous):
integral cos15xcos4x dx @loser66
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OpenStudy (loser66):
just apply formula cos a cos b = 1/2( cos (a+b) + cos (a-b) ) , your a = 15x, your b = 4x . that's it
OpenStudy (anonymous):
1/2(cos(19x)+cos(11x)) is that all?
OpenStudy (loser66):
yup, and then take integral term by term
OpenStudy (anonymous):
damn, i expected it to be more difficult....well, thats one down
OpenStudy (loser66):
hehehe... be on the Earth!! please
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