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malexander Group TitleBest ResponseYou've already chosen the best response.0
cos(x+y)=cosxacosysinxsiny cos(xy)=cosxcosy+sinxsiny addition produces 2cosxcosy
 2 years ago

lgbasallote Group TitleBest 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)?
 2 years ago

malexander Group TitleBest ResponseYou've already chosen the best response.0
Its an identity.
 2 years ago

kaisan Group TitleBest ResponseYou've already chosen the best response.0
i think so but i'm not sure
 2 years ago

lgbasallote Group TitleBest ResponseYou've already chosen the best response.1
sin(x+y) = sinxcosy + sinycosx sin(xy) = sinxcosy  sinycosx can you do it from here?
 2 years ago

kaisan Group TitleBest 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?
 2 years ago

lgbasallote Group TitleBest ResponseYou've already chosen the best response.1
no...you substitute those into your problem sin(x+y)  sin (xy) = sinxcosy + cosxsiny  (sinxcosy  cosxsiny)
 2 years ago

kaisan Group TitleBest ResponseYou've already chosen the best response.0
i'm still confused
 2 years ago

lgbasallote Group TitleBest ResponseYou've already chosen the best response.1
with what?
 2 years ago

kaisan Group TitleBest ResponseYou've already chosen the best response.0
how to do all of this in general
 2 years ago

lgbasallote Group TitleBest ResponseYou've already chosen the best response.1
basically you memorize the identities...
 2 years ago

lgbasallote Group TitleBest ResponseYou've already chosen the best response.1
i did not do anything fancy...all i did was substitute identities
 2 years ago

lgbasallote Group TitleBest ResponseYou've already chosen the best response.1
so regarding this problem...you're good?
 2 years ago

kaisan Group TitleBest ResponseYou've already chosen the best response.0
not really...
 2 years ago

lgbasallote Group TitleBest ResponseYou've already chosen the best response.1
sinxcosy + cosxsiny  (sinxcosy  cosxsiny) sinxcosy = cosxsiny  sinxcosy + cosxsiny
 2 years ago

lgbasallote Group TitleBest ResponseYou've already chosen the best response.1
that's a + not an =
 2 years ago

kaisan Group TitleBest ResponseYou've already chosen the best response.0
i don't understand what you did
 2 years ago

lgbasallote Group TitleBest ResponseYou've already chosen the best response.1
i distributed the minus sign
 2 years ago

lgbasallote Group TitleBest ResponseYou've already chosen the best response.1
so you're good now?
 2 years ago

kaisan Group TitleBest ResponseYou've already chosen the best response.0
yes thanks ^^
 2 years ago
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