Tangent lines and derivatives Help!

I can solve derivatives alright but I don't understand tangent lines at all.

Find the equation of the tangent line to the curve http://webwork.math.uwyo.edu/webwork...494d69bcd1.png at the point http://webwork.math.uwyo.edu/webwork...61ec146821.png. The equation of this tangent line can be written in the form http://webwork.math.uwyo.edu/webwork...9a0aa8b841.png

where m is?

And b is?

I solved the derivative down to

6[2sin(x)+sec(x)tan(x)]

I think this is right and hopefully you needed to solve the derivative.

Thanks to anyone who can help

Casas4