lim (x^2 + 2x + 3)/(x^2 - 2x - 3) as x->3 - Wolfram|Alpha
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    Series expansion at x=3:

    link to /input/?i=7%2F8%2B9%2F%282+%28-3%2Bx%29%29%2B1%2F32+%28-3%2Bx%29-1%2F128+%28-3%2Bx%29%5E2%2B1%2F512+%28-3%2Bx%29%5E3-%28-3%2Bx%29%5E4%2F2048&lk=1&a=ClashPrefs_*Math-
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