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Finding Horizontal Asymptotes

Mark

What are the horizontal asymptotes of the graph of $y = \displaystyle\frac{x^2 + 1}{\sqrt{x^4 + 2x^2 + 4}}$ ?

A

$\displaystyle y = 1$ only

B

$\displaystyle y = 2$ only

C

$\displaystyle y = 0$ only

D

$\displaystyle y = -1$ and $y = 1$ only

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