Question

xtanx/(x+2) 导数是多少?

Answer 1

[xtanx/(x+2)]' =[(xtanx)'-xtanx*(x+2)']/(x+2)^2 =[x'*tanx+x*(tanx)'-xtanx]/(x+2)^2 =(tanx+x*sec²x-xtanx)/(x+2)^2