#
# Numerical Mathematics and Computing, Fifth Edition
# Ward Cheney & David Kincaid
# Brooks/Cole Publ. Co.
# (c) 2004
#
# file:  derivative
#
# Using Maple to determine derivative symbolically as well as
# evaluating the numerical approximation of the derivative:

 diff(sin(x), x);
 evalf(subs(x = 1.2309594154,%));