求导(1) y=2x+(1/x) -lnx (2)y=(1-x^3)/根号x (3)y=x^3sinx (4)y=e^-2x sin3x (5)y=ln(x+根号x^2-a^2)
问题描述:
求导(1) y=2x+(1/x) -lnx (2)y=(1-x^3)/根号x (3)y=x^3sinx (4)y=e^-2x sin3x (5)y=ln(x+根号x^2-a^2)
答
(1)y'=2-1/x²-1/x(2)y'=-5/2*x的二分之三次幂-1/(2x的二分之三次幂) 符号比较难敲,先用汉字代替(3)y'=3x²sinx+x^3cosx(4)y'=-2e^-2xsin3x+3e^-2xcos3x(5)当x>0时 y=ln(2x-a²) y'=...