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AP® Calculus AB-BC

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Difficult

Algebraic Limit Involving Trig

APCALC-KRKEWB

Evaluate the following:

$$\lim\limits_{x \to {{\frac{\pi }{2}}^ + }} \cfrac{{18}}{{3 - {e^{\sec x}}}}$$

A

$9$

B

$6$

C

$\cfrac{9}{2}$

D

Nonexistent.