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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