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OpenStudy (pottersheep):
Stuck on Trig identities! :( Help please~ How do I prove cos(x+y)cosy + sin(x+y)siny = cosx??
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OpenStudy (anonymous):
just to understanding the formula : cosAcosB + sinAsinB = cos(A-B)
OpenStudy (pottersheep):
Yep I understand
OpenStudy (pottersheep):
I cant get the answer still though
OpenStudy (anonymous):
change A to (x+y) and B to y
OpenStudy (pottersheep):
I got it! Ha, it was easier than I thought :)
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OpenStudy (anonymous):
yep, very easy :)
OpenStudy (pottersheep):
You can have the medal :)
OpenStudy (anonymous):
thanks, lol
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