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pottersheep
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Stuck on Trig identities! :( Help please~
How do I prove
cos(x+y)cosy + sin(x+y)siny = cosx??
 2 years ago
 2 years ago
pottersheep Group Title
Stuck on Trig identities! :( Help please~ How do I prove cos(x+y)cosy + sin(x+y)siny = cosx??
 2 years ago
 2 years ago

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tanjung Group TitleBest ResponseYou've already chosen the best response.1
just to understanding the formula : cosAcosB + sinAsinB = cos(AB)
 2 years ago

pottersheep Group TitleBest ResponseYou've already chosen the best response.0
Yep I understand
 2 years ago

pottersheep Group TitleBest ResponseYou've already chosen the best response.0
I cant get the answer still though
 2 years ago

tanjung Group TitleBest ResponseYou've already chosen the best response.1
change A to (x+y) and B to y
 2 years ago

pottersheep Group TitleBest ResponseYou've already chosen the best response.0
I got it! Ha, it was easier than I thought :)
 2 years ago

tanjung Group TitleBest ResponseYou've already chosen the best response.1
yep, very easy :)
 2 years ago

pottersheep Group TitleBest ResponseYou've already chosen the best response.0
You can have the medal :)
 2 years ago

tanjung Group TitleBest ResponseYou've already chosen the best response.1
thanks, lol
 2 years ago
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