derivat

s=poly(0,'s');
derivat(1/s)  // -1/s^2;

p1 = poly([1 -2 1], 'x', 'coeff')
derivat(p1)

p2 = poly([1 -4 2], 'y', 'coeff')
derivat(p2)

p3 = poly(ones(1, 10), 'z', 'coeff')
derivat(p3)

p4 = poly([-1 1], 't', 'roots')
derivat(p4)

s = %s; p5 = s^{-1} + 2 + 3*s
derivat(p5)