(x-1)^2*(x+1)^3=[(x-1)(x+1)]^2*(x+1)=(x^2-1)^2*(x+1)
=(x^4-2x^2+1)(x+1)=x^5+x^4-2x^3-2x^2+x+1
所以导数为5x^4+4x^3-6x^2-4x+1