Posted by Natash on Saturday, November 15, 2008 at 4:47pm.
You have not provided an equation.
Equations have an "=" sign.
You must have left something out.
Perhaps they just want you to write the term tan^2x-sec^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^2x-sec^2x = tan^2 x - (tan^2 x + 1)
= -1
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