If $\displaystyle{}\lim_{x \rightarrow 0} \frac{ae^{x} - b \cos x}{x} = 5$, then.
$a$ and $b$ are uniquely determined.
$a$ is uniquely determined, but not $b$.
$b$ is uniquely determined, but not $a$.
neither $a$ nor $b$ is uniquely determined.
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