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OpenStudy (anonymous):
sin2xcosx+cos2xsinx=1/2
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OpenStudy (tpaulus):
http://www.wolframalpha.com/input/?t=crmtb01&f=ob&i=sin2xcosx%2Bcos2xsinx%3D1%2F2
OpenStudy (loser66):
@xxaznben wolframalpha doesn't help you on tests, right? try to do it by hand, please. you have to prove it or solve for x?
OpenStudy (tpaulus):
Use you cosine and sine double angle identities!
OpenStudy (loser66):
@tpaulus ok, show him, please. few steps still help
OpenStudy (loser66):
warning: you don't know sin 2x or sin^2 x, have to confirm that first
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