Antirunan f(x)=10x √x adalah

f(x) = 10x * x^-1
            misalkan u =10x, u' = 10, v = x^-1, v' = -1*1 x ^-2 = -x ^-2
f' (x) = u'v + v'u = 10* x^-1 + (-x ^-2)*10x = 10x^-1 + (-10x ^-1) = 10 x^-1 - 10 x^-1
        = 0