(ab)'=a'b+ab'
f(x)=(x+1)²(x-1)³
f'(x)=2(x+1)(x-1)³+(x+1)²3(x-1)²
f'(x)=(x+1)(x-1)²[2（x-1）+3(x+1)]
f'(x)=(x+1)(x-1)²(5x+1)
f`(x)=2(x+1)(x-1)^3+(x+1)^2 3(x-1)^2
=(x+1)(x-1)^2{2x-2+3x+3}
=(x+1)(x-1)^2(5x+1)
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