Posted by **Hannah** on Friday, March 5, 2010 at 6:31pm.

Perform the addition or subtraction.

tanx - sec^2x/tanx

tan^2(x)/tan(x) - sec^2x/tanx =

tan^2x sec^2x / tanx

then I use the identity 1+tan^2u=sec^2u

I do not know what to do at this point.

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