trig
posted by Natash .
simplify and write the trigonometric equation in terms of sine and cosine.
tan^2xsec^2x

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Perhaps they just want you to write the term tan^2xsec^2x in terms of sines and cosines. If so, they should have said so. 
from the main Pythagorean Identity we know
tan^2 x + 1 = sec^2 x
so tan^2xsec^2x = tan^2 x  (tan^2 x + 1)
= 1
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