1 - tan^2 x (divided by) 1+ tan^2 x = 1 - 2 sin^2 x
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(1 - tan^2 x)/(1 + tan^2 x)
= (cos^2 x - sin^2 x)/(cos^2 x + sin^2 x)
= (cos^2 x - sin^2 x)
= 1 - 2 sin^2 x
= (cos^2 x - sin^2 x)/(cos^2 x + sin^2 x)
= (cos^2 x - sin^2 x)
= 1 - 2 sin^2 x
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Good luck
Good luck