Let's do some calculus! (28)

Calculus Level 5

\[ \large {\lim_{x \to 0}} \ \dfrac{\cos^2 x - \cos x - e^x \cos x + e^x - \dfrac{x^3}{2}}{x^n} \]

Find the value of \(n\) for which the above limit is finite and non-zero.

Notations: \(e \approx 2.71828\) is the Euler's number.


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