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Stuck on Trig identities! :( Help please~
How do I prove
cos(x+y)cosy + sin(x+y)siny = cosx??
 one year ago
 one year ago
Stuck on Trig identities! :( Help please~ How do I prove cos(x+y)cosy + sin(x+y)siny = cosx??
 one year ago
 one year ago

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tanjungBest ResponseYou've already chosen the best response.1
just to understanding the formula : cosAcosB + sinAsinB = cos(AB)
 one year ago

pottersheepBest ResponseYou've already chosen the best response.0
I cant get the answer still though
 one year ago

tanjungBest ResponseYou've already chosen the best response.1
change A to (x+y) and B to y
 one year ago

pottersheepBest ResponseYou've already chosen the best response.0
I got it! Ha, it was easier than I thought :)
 one year ago

pottersheepBest ResponseYou've already chosen the best response.0
You can have the medal :)
 one year ago
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