Question: Evaluate the following limits if they exist. If a limit does not exist, explain why.

1. $$\underset{a\to 1}{\mathop{\lim }}\,\frac{{{a}^{2}}+6a-7}{a-1}$$
2. $$\underset{x\to 0}{\mathop{\lim }}\,\frac{\cos x}{x}$$
3. $$\underset{x\to {{0}^{+}}}{\mathop{\lim }}\,\ln x$$

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