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Math Help - help on trig identity containing fractions and a one

  1. #1
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    help on trig identity containing fractions and a one

    \frac{\frac{cos^2B}{sin^2B}-cos^2B}{\frac{1}{sin^2B}-1}=?cos^2B
    My real problems is that I can't see what to do with the expression containing both fractions and an integer, divided by another expression containing a fraction and an integer. Can you point me in the right direction?
    ~sif
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  2. #2
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     1 = \sin^2(B)+\cos^2(B)

    That will take care of the integer.
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