Posted by Animesh on Wednesday, February 8, 2012 at 1:51am.
You should recognize the 5-12-13 triangle
if sinŲ = 12/13, then
cosŲ = 5/13
so (1-cosŲ)/(1+cosŲ)
= (1-5/13)/(1+5/13)
= (8/13) / (18/13)
= (8/13)(13/18)
=8/18 = 4/9
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