Lời giải:
\(y=(x^2+1)(x^2+2)(x^2+3)\)
\(\Rightarrow y'=(x^2+1)'[(x^2+2)(x^2+3)]+(x^2+1)[(x^2+2)(x^2+3)]'\)
\(y'=2x(x^2+2)(x^2+3)+(x^2+1)[(x^2+2)'(x^2+3)+(x^2+2)(x^2+3)']\)
\(y'=2x(x^2+2)(x^2+3)+2x(x^2+1)(x^2+3)+2x(x^2+2)(x^2+1)\)
\(y'=2x[(x^2+1)(x^2+2)+(x^2+2)(x^2+3)+(x^2+3)(x^2+1)]\)