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u=x^2+1
du =2x dx
2du=4xdx
jadi
integral 4x√x^2+1 dx
2√u du
2.u^1/2 du
2.2/3. u^3/2 +c
4/3 u.√u +c
4/3 (x^2 +1) √(x^2+1)