(1-sin^2 theta)/ (csc^2 theta - 1)
= (1- sin^2 Ø)/( (1 - sin^2 Ø)/sin^2 Ø ) = (1 - sin^2 Ø) (sin^2 Ø)/(1 - sin^2 Ø) = sin^2 Ø
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