%problem 4 erfan bayat 91109843
x = 30;
y = (pi)/6;
z = x * sin(y);
Er = (1/2) * 10^(-5);% ronde absolute error
er = (1/2) * 10^(-4);% ronde relative error
zprimx = sin(y);
zprimy = x*cos(y);
Ep = (x*zprimx + y*zprimy) * er;
ep = Ep/z;
E = Er + Ep;%total absolute error
e = er + ep;%total relative error
E
e