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October 7, 2015
Posted by **Stacey Graham** on Sunday, May 2, 2010 at 8:59pm.

tan^2(theta)-3sin(theta)tan(theta)sec(theta)

- trig -
**MathMate**, Sunday, May 2, 2010 at 9:31pmSubstitute

sec(θ)= 1/cos(θ)

sin(θ)/cos(θ) = tan(θ)

and simplify.