给一个函数y怎么求dy
dy 指的是对 x 进行求导。每一道题目的解法均存在差异,比如:
已知 y = lntan(x/2),求 dy:
dy/dx = y'
= [tan(x/2)]'/tan(x/2)
= sec²(x/2)· ½ / tan(x/2)
= 1 / [2cos(x/2)sin(x/2)]
= 1 / sinx
dy 指的是对 x 进行求导。每一道题目的解法均存在差异,比如:
已知 y = lntan(x/2),求 dy:
dy/dx = y'
= [tan(x/2)]'/tan(x/2)
= sec²(x/2)· ½ / tan(x/2)
= 1 / [2cos(x/2)sin(x/2)]
= 1 / sinx