"Line integral" P = 1 - y Q = x x = 2 cos(t) y = 2 sin(t) defint(P d(x,t) + Q d(y,t), t, 0, 2pi) "Surface integral" x = quote(x) -- clear x y = quote(y) -- clear y h = sqrt(4 - x^2) defint(d(Q,x) - d(P,y), y, -h, h, x, -2, 2) Run