So, I have this curve C: y=2x^3 and a point P(p, 2p^3), p being a positive number. With the following graphic:

http://img404.imageshack.us/my.php?i...gagoil1.th.png

L1 and L2 are tangent lines of C passing through P.

I am asked to express the slope of L2 in terms of p.