Mohon bantuannyaaaaaaa......

[tex]y= \sqrt{ x^{2} +1} [/tex]
[tex]y= (x^{2} +1)^{ \frac{1}{2} } [/tex]

[tex]y'= \frac{1}{2} (x^{2} +1)^{ -\frac{1}{2} }. 2x [/tex]
[tex]y'= \frac{x}{ \sqrt{x^{2} +1} } [/tex]