f(x)=(8x3+4x)(2x2+5)f(x)=(8x^3+4x)(2x^2+5)f(x)=(8x3+4x)(2x2+5)
f′(x)=(24x2+4)(2x2+5)+4x(8x3+4x)=48x4+120x2+8x2+20+32x4+16x2=80x4+144x2+20f'(x)=(24x^2+4)(2x^2+5)+4x(8x^3+4x)=48x^4+120x^2+8x^2+20+32x^4+16x^2=80x^4+144x^2+20f′(x)=(24x2+4)(2x2+5)+4x(8x3+4x)=48x4+120x2+8x2+20+32x4+16x2=80x4+144x2+20
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