求导数,第二题
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求导数,第二题
求导数,第二题
求导数,第二题
y=(x^2+1)(2x^3-4x+1)
y'=(x^2+1)'(2x^3-4x+1) +(x^2+1)(2x^3-4x+1)'
=2x(2x^3-4x+1) +(x^2+1)(6x^2-4)
=4x^4-8x^2+2x +6x^4-4x^2+6x^2-4
=10x^4-6x^2+2x-4