Posted by Hannah on Friday, March 5, 2010 at 6:31pm.
from you second line
tan^2(x)/tan(x) - sec^2x/tanx
= (tan^2 x - sec^2 x)/tanx
= (tan^2 x - (1 + tan^2 x))/tanx
= -1/tanx or -cotx or -sinx/cosx
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