Posted by **Josh** on Thursday, April 19, 2012 at 8:26pm.

sin^4t-cos^4t/sin^2t cos^2t= sec^2t-csc^2t

i have =(sin^2t+cos^2t)(sin^2t+cos^2t)/sin^2tcos^2t

then do i go =(sin^2t+cos^2t)/sin^2tcos^2t

stumped

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