1. a. Interpolate the function sin(x) at 5 Chebyshev points (using both Chebyshev-Gauss-Lobatto, and Chebyshev-Gauss) over the interval [0; pi/2].

I used this code below, but it is not working in matlab because its giving my a "plot(chebyshev(x,y));" error. Could you please help me fix the code?

N=5; h=1/N; x=0:h:pi/2; y = sin(2*pi*x); plot(polyfit(x,y));

title('Chebyshev Sine Plot'); xlabel('x-axis'); ylabel('y-axis'); grid