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OpenStudy (anonymous):
how to integrate (cos3x)(cos5x)dx
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terenzreignz (terenzreignz):
Someone once told me that product-to-sum formulas are near-useless in trig but useful in calculus ^_^
OpenStudy (experimentx):
cos(a)cos(b) = 1/2 [ cos(a-b) - cos(a+b) ] and integrate
terenzreignz (terenzreignz):
lol, yeah that ^ ^_^
OpenStudy (anonymous):
omg thank you so much!!
terenzreignz (terenzreignz):
^_^ Welcome to Openstudy, and look around, see if you can help out a few people :D
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OpenStudy (anonymous):
haha thanks but my math kinda sucks ):
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