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AP® Calculus AB-BC

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Moderate

Upper and Lower Bounds Hard

APCALC-ZNTKNT

Which of the following functions has an upper bound but no lower bound?

A

$y=\tan^{-1}x$

B

$y=\cfrac{1}{1-x^2}$

C

$y=\cfrac{|x|}{x}$

D

$y=-e^{-x}$