If y = sin (ln x), then which one of the following is correct?
1
\(\frac{{{d^2}y}}{{d{x^2}}} + y = 0\)
2
\(\frac{{{d^2}y}}{{d{x^2}}} = 0\)
3
\({x^2}\frac{{{d^2}y}}{{d{x^2}}} + x\frac{{dy}}{{dx}} + y = 0\)
4
More than one of the above
5
None of the above