高校数学の質問スレ Part425

>>42
(1/x)'
=lim[h→0](1/(x+h)-1/x)/h
=lim[h→0]((x-(x+h))/(x(x+h)))/h
=lim[h→0]-h/(hx(x+h))
=lim[h→0]-1/(x^2+hx)
=-1/(x^2)