Numerical Integrator

The integrand — the function whose area under the curve you want. Use ^ for powers and write products explicitly, e.g. x * exp(-x^2).

The left endpoint of the integration interval. It must be a finite number and smaller than the upper bound.

The right endpoint of the integration interval. The area is computed between a and b.

How many equal slices the interval is cut into for Simpson’s and the trapezoidal rule. More subintervals mean a finer grid and a more accurate result, at the cost of more work.