Jika f(x)= 3x-2/x+4 turunan ke dua dari f pangkat -1(x) adalah.

3x-2/x+4=y
3x-2=xy+4y
3x-xy=2+4y
x(3-y)=2+4y
x=(2+4y)/(3-y)

fpangkat-1(x)=(2+4y)/(3-y)

turunan 1: (u'v-uv')/v²
=(4.(3-y)-(2+4y).-1)/(3-y)²
=14/(9-6y+y²)

turunan 2: (u'v-uv')/v²
=(0.(9-6y+y²)-14.(-6+2y))/(9-6y+y²)²
=-14(-6+2y)/(3-y)⁴