4.设f(x)在R上有二阶连续导数,且满足 (dfrac (1)(n))=dfrac ({n)^2}({n)^2+1}(n=1,2,... ), 则f(x)在 x=0-|||-处的二次泰勒多项式为 ()-|||-(A) https:/img.cdnjtzy.com/zyb_c49d41472a9d3300b2a0311f921b6df7.jpg-2(x)^2 (B) -2(x)^2 (C) https:/img.cdnjtzy.com/zyb_c49d41472a9d3300b2a0311f921b6df7.jpg-(x)^2 (D) https:/img.cdnjtzy.com/zyb_c49d41472a9d3300b2a0311f921b6df7.jpg+x-(x)^2