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Calculus Level 4

\[ \large \lim_{x \to 0} \frac{ 1- \displaystyle \prod_{k=1}^{100} \cos kx}{x^2} = \, ? \]

Bonus: Generalize for \(n\) or \[ \lim_{x \to 0} \frac{ 1- \displaystyle \prod_{k=1}^{n} \cos kx}{x^2}\]


For other problems: Check your Calibre
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