Calculus Examples

$lim_{x \to \infty} \frac{e^{9 x} + e^{- 9 x}}{e^{9 x} - e^{- 9 x}}$

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$lim_{x \to \infty} \frac{e^{9 x} + e^{- 9 x}}{e^{9 x} - e^{- 9 x}}$