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anonymous
 5 years ago
Find sin (x+y), assuming that sin x= 2/3, cos y=1/4 and both x and y are in quadrant IV.
anonymous
 5 years ago
Find sin (x+y), assuming that sin x= 2/3, cos y=1/4 and both x and y are in quadrant IV.

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0sin(x+y)=sinxcosy+cosysinx

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0are you familiar with this identity?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0i have to look at my notes

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0do you know how to find cos(x) if you are given sin(x)? because you need that too.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0This is incorrect I think you are mistaking it with sec(x)=1/cos (x)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Okay, so we know this identity sin(x+y)=sin(x)cos(y)+cos(y)sin(x) now we have to plug in what we know

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0You know sin(x),cos(y) you don't know sin(y),cos(x)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0i have no idea what to do

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0So you need to find what you don't know are you familiar with sohcahtoa

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0a bit, but I don't even know how you got sin (x+y)=sin (x)cos(y)+cos(y)sin(x)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0this is identity, you just need to know that

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0ok, I see it in my notes under cosine of a sum or difference
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