Function limit/Several fractions/Exercise

Determine for the following functions if the function limit exists and, in case, what value it takes.

1. ${}\operatorname {lim} _{x\rightarrow 0}\,{\frac {\sin x}{x}}$,
2. ${}\operatorname {lim} _{x\rightarrow 0}\,{\frac {(\sin x)^{2}}{x}}$,
3. ${}\operatorname {lim} _{x\rightarrow 0}\,{\frac {\sin x}{x^{2}}}$,
4. ${}\operatorname {lim} _{x\rightarrow 1}\,{\frac {x-1}{\ln x}}$.

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