# trig

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If the value of sin theta =12/13 then find the value of 1-cos theta/1+cos theta.

• trig -

You should recognize the 5-12-13 triangle
if sinØ = 12/13, then
cosØ = 5/13

so (1-cosØ)/(1+cosØ)
= (1-5/13)/(1+5/13)
= (8/13) / (18/13)
= (8/13)(13/18)
=8/18 = 4/9

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