tan^2Ө/sin^2Ө-1=tan^2Ө
= (sin^2 Ø/(sin^2 Ø cos^2 Ø - (sin^2 Ø cos^2 Ø)/(sin^2 Ø cos^2 Ø) = (sin^2 Ø - sin^2 Ø cos^2 Ø)/(sin^2 Ø cos^2 Ø) = sin^2 Ø (1 - cos^2 Ø)/(sin^2 Ø cos^2 Ø = sin^2 Ø (sin^2 Ø)/(sin^2 Ø cos^2 Ø) = sin^2 Ø/cos^2 Ø = tan^2 Ø = RS
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