OpenStudy (anonymous):

integral cos15xcos4x dx @loser66

4 years ago
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

4 years ago
OpenStudy (anonymous):

1/2(cos(19x)+cos(11x)) is that all?

4 years ago
OpenStudy (loser66):

yup, and then take integral term by term

4 years ago
OpenStudy (anonymous):

damn, i expected it to be more difficult....well, thats one down

4 years ago
OpenStudy (loser66):

hehehe... be on the Earth!! please

4 years ago
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