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malexanderBest ResponseYou've already chosen the best response.0
cos(x+y)=cosxacosysinxsiny cos(xy)=cosxcosy+sinxsiny addition produces 2cosxcosy
 one year ago

lgbasalloteBest ResponseYou've already chosen the best response.1
take the left hand side...do you know the formula for sin(x+y) and sin(xy)?
 one year ago

kaisanBest ResponseYou've already chosen the best response.0
i think so but i'm not sure
 one year ago

lgbasalloteBest ResponseYou've already chosen the best response.1
sin(x+y) = sinxcosy + sinycosx sin(xy) = sinxcosy  sinycosx can you do it from here?
 one year ago

kaisanBest ResponseYou've already chosen the best response.0
it looks familiar but i can't figure it out. is it one of the cosine identities?
 one year ago

lgbasalloteBest ResponseYou've already chosen the best response.1
no...you substitute those into your problem sin(x+y)  sin (xy) = sinxcosy + cosxsiny  (sinxcosy  cosxsiny)
 one year ago

kaisanBest ResponseYou've already chosen the best response.0
how to do all of this in general
 one year ago

lgbasalloteBest ResponseYou've already chosen the best response.1
basically you memorize the identities...
 one year ago

lgbasalloteBest ResponseYou've already chosen the best response.1
i did not do anything fancy...all i did was substitute identities
 one year ago

lgbasalloteBest ResponseYou've already chosen the best response.1
so regarding this problem...you're good?
 one year ago

lgbasalloteBest ResponseYou've already chosen the best response.1
sinxcosy + cosxsiny  (sinxcosy  cosxsiny) sinxcosy = cosxsiny  sinxcosy + cosxsiny
 one year ago

lgbasalloteBest ResponseYou've already chosen the best response.1
that's a + not an =
 one year ago

kaisanBest ResponseYou've already chosen the best response.0
i don't understand what you did
 one year ago

lgbasalloteBest ResponseYou've already chosen the best response.1
i distributed the minus sign
 one year ago

lgbasalloteBest ResponseYou've already chosen the best response.1
so you're good now?
 one year ago
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