L'Hopitals Rule
Lim x ----.>0 (cos(9x) *9)/1 = lim x----> 0 9 cos(0) = 9
Thanks EP....here's another way not using L'Hopital's
lim sin (9x)
x → 0 ______ multiply top/bottom by 9
x
lim x → 0 9 sin (9x)
_________ let 9x = θ
9x
lim x → 0 9 sin ( θ)
________
θ
9 * lim x → 0 sin ( θ )
_______ =
θ
9 * 1 =
9
I actually like your way better.1...I just happened across l'Hopital and thought I would use it.... Thanx ! ~EP