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Question
`\lim_{x \to \pi/2} \frac{e^\cos x - 1}{\cos x}`
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Solution
\[\text{ If } x \to \frac{\pi}{2}, \text{ then } \cos x \to 0 . \]
\[\text{ Let } y = \cos x\]
\[ = \lim_{y \to 0} \left[ \frac{e^y - 1}{y} \right]\]
\[ = 1\]
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