Function with exactly one parameter of the form z = f(x).
definable domain
endValue = f(upper endpoint of domain).
startValue = f(lowest endpoint of domain).
Evaluation of the slope = f'(x) with strict checking whether x is within the function's domain.
Evaluation of the slope = f(x) with fuzzy checking whether x is within the function's domain.
Evaluation of z = f(x) with strict checking whether x is within the function's domain.
Evaluation of z = f(x) with fuzzy checking whether x is within the function's domain.