It is good practice to plot the integrand function to check whether it is "well behaved before you attempt to integrate. Singularities (i.e. x values where the f(x) tends towards minus or plus infinity) or other irregular behaviour (such as f(x) = sin() close to x = 0 are difficult to handle numerically. 1. Write a function with name plot quad which takes the same arguments as the quad command (i.e. f, a and b) and which . (i) creates a plot of the integrand f(x) and (ii) computes the integral numerically using the quad function. The return values should be as for the quad function