Handyfirma30.9.20A3

f(x) = ((-(10 / 30^(3))) * x^(3)) + (40 / 15^(2) * x^(2)) - (20 / 3 * x) + 1280
a: f(240)
A, B = Extremum(f)
NDerivative(f)
NDerivative(f)
NDerivative(f)
f'(x) = f'(x)
b: f'(120)
C = TurningPoint(f)
c = Integral(f, 0, 360)