Question 18522
tan^2x - sin^2x = (sin^2x)(tan^2x)

sin^2x/cos^2x - sin^2x 
sin^2x(1/cos^2x - 1) 
sin^2x((1-cos^2x)/cos^2x) 
sin^2x(sin^2x/cos^2x) 
sin^2x(tan^2x) 

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