For the function f and value x = c , use a sequence of approximations to estimate f'(c) .
a) f'(c) = limh to 0 f(c + h) - f(c)h
b) f'(c) = f(c + h) - f(c - h)2h
c) f'(c) = f(c) - f(c - h)h
d) f'(c) = f(c + h) - f(c)2h