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Limit for cosine:
$$\lim_{x \to 0} \frac{1 - \cos x}{x^2} = \frac{1}{2}$$
General form: $$\lim_{x \to 0} \frac{1 - \cos kx}{x^2} = \frac{k^2}{2}$$.
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Limit for cosine:
$$\lim_{x \to 0} \frac{1 - \cos x}{x^2} = \frac{1}{2}$$
General form: $$\lim_{x \to 0} \frac{1 - \cos kx}{x^2} = \frac{k^2}{2}$$.
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