888888888888888888888888888888888888888888888888888888888888888888888888888888
y'=((x^2+3)(x^6-1))'=(x^2+3)'(x^6-1))+(x^2+3)(x^6-1)'=2x*(x^6-1)+6*x^5(x^2+3)=8x^7+18x^5-2x
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y'=((x^2+3)(x^6-1))'=(x^2+3)'(x^6-1))+(x^2+3)(x^6-1)'=2x*(x^6-1)+6*x^5(x^2+3)=8x^7+18x^5-2x