\[ y'(x)=\frac {\frac {x^2}{2}+x^3 \sqrt {x^2-4 y(x)+2 x+1}+x+\frac {1}{2}}{x+1} \] ✓ Mathematica : cpu = 0.481971 (sec), leaf count = 105
\[\left \{\left \{y(x)\to \frac {1}{36} \left (24 c_1 x^3-36 c_1 x^2+72 c_1 x-72 c_1 \log (x+1)-36 c_1{}^2-4 x^6+12 x^5-33 x^4+36 x^3+24 x^3 \log (x+1)-27 x^2-36 x^2 \log (x+1)+18 x-36 \log ^2(x+1)+72 x \log (x+1)+9\right )\right \}\right \}\] ✓ Maple : cpu = 0.274 (sec), leaf count = 38
\[ \left \{ {\it \_C1}-{\frac {2\,{x}^{3}}{3}}+{x}^{2}-2\,x+2\,\ln \left ( 1+x \right ) -\sqrt {{x}^{2}+2\,x+1-4\,y \left ( x \right ) }=0 \right \} \]