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limx→01−∏k=1100coskxx2= ? \large \lim_{x \to 0} \frac{ 1- \displaystyle \prod_{k=1}^{100} \cos kx}{x^2} = \, ? x→0limx21−k=1∏100coskx=?
Bonus: Generalize for nnn or limx→01−∏k=1ncoskxx2\displaystyle \lim_{x \to 0} \frac{ 1-\prod_{k=1}^{n} \cos kx}{x^2}x→0limx21−∏k=1ncoskx.
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