Hi all;

I have a function with calculate a result as fallow:

res = (50.0 * (1.0 + sin((x / 23.0 - (x / 23)) * 360.0 * pi / 180.0)))
## and x is the variable  which vary on each call.

know I need the have the slope of the curve as each point! :-/
is there any method out? or any fast idea to let me find it out?
tnx

Regards,
Ali R. Taleghani
+1(424) 279-4548
@linkedIn <http://ir.linkedin.com/in/taleghani>