SOLUTION: please help me solve this question: Given that tan (x+y)=3 and tan (x-y)=1, find the exact value of tan 2y.

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Question 832693: please help me solve this question: Given that tan (x+y)=3 and tan (x-y)=1, find the exact value of tan 2y.
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
Given that tan (x+y)=3 and tan (x-y)=1, find the exact value of tan 2y.
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tan (x+y)=3
tan (x-y)=1
..
let(x+y)=u
let(x-y)=v
..
tan%28u-v%29=%28tan%28u%29-tan%28v%29%29%2F%281%2Btan%28u%29tan%28v%29%29

tan%282y%29=%283-1%29%2F%281%2B%283%2A1%29%29=2%2F4
tan%282y%29=1%2F2