Need help with 2 MATLAB questions. Thanks.

QUESTION 3 Consider a function y xA2-1. Which of the following codes correctly perform differentiation of this function on MATLAB? x10:10; y=x.^2-1; dy_dx - diff(y)/diff(x) X-10:10; 2-1; dy, dx = diff(y)/diff(x) x10:10; dy-dx diff(x)/diff(y) = x-10:10 y=x.^2-1; dy-dx = diff(x)/diff(y) QUESTION 4 Consider the equation: y-x^3 + x^2-x + 5. Which of the following codes DOES NOT estimate the integral of y with respect to x, evaluated from-10 to +10? quad(x.A3+x.A2 - x +5',-10,10) x = linspace(-10, 10,51); trapz(x,y) quadl(".ng + X.^2- + 5.-10.10) x linspace(-10,10,51); y=x.ng + x.^2 _ x + 5; gradientx,y)