Integration of a function using the trapezoid rule?

I need to integrate the function f(x)=sin(x) between the bounds of 0 and pi/2 using the trapezoid rule repeating the calculation with 3 different numbers of panels N=20,30,50. Also I have to show the errors between the results and the exact value of the integral. I'm not familiar with the trapezoid rule and I'm really struggling with this question. Thank you

Answer 1

[Matt J]

The TRAPZ command will be helpful here.