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OpenStudy (tommythetank23):

Verify The Identity. cos (x - y) - cos (x + y) = 2 sin x sin y

OpenStudy (anonymous):

wrong section bb

OpenStudy (okdutchman7):

Welcome to OpenStudy. There will be people who are better equipped to help you in the math section: http://openstudy.com/study#/groups/Mathematics

OpenStudy (anonymous):

WELCOME TO OS

umerlodhi (umerlodhi):

hi welcome to openstudy

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