求教两道微积分题
问题描述:
求教两道微积分题
求导:
(cosx+sinx)^2
loge[(x+4)/(x-3)]
不好意思第一题打错了,应该是
(cosx+sinx)^3
答
(1){(cosx+sinx)^3}'=3(cosx+sinx)^2*(cosx+sinx)'
=3(cosx+sinx)^2*(-sinx+cosx)
=3(cosx+sinx)^2*(cosx-sinx)
(2){loge[(x+4)/(x-3)]}'=1/[(x+4)/(x-3)]*[(x+4)/(x-3)]'
=[(x-3)/(x+4)]*[(-7)/(x-3)^2]
=(-7)/[(x+4)(x-3)]