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January 26, 2015

January 26, 2015

Posted by **Animesh** on Wednesday, February 8, 2012 at 1:51am.

- trig -
**Reiny**, Wednesday, February 8, 2012 at 8:27amYou 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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