Question

2. Find the following limits if they exist. \text { (a) } \lim _{n \rightarrow \infty} \frac{\left(n^{2}-4\right)(2 n+1)^{3}}{n^{2}\left(3 n^{2}-2\right)} \text {, } \text { (b) } \lim _{x \rightarrow 5} \frac{x^{2}-2 x-15}{x-5} \text {, }

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