Evaluate $\lim_{x \to 0} \left( \frac{\cos x - 1}{\cos 2x - 1} \right)$
Added by Melissa C.
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Step 1: Substitute x = 0 to check indeterminacy: cos 0 - 1 = 0 and cos(2·0) - 1 = 0, so the expression is 0/0 (indeterminate). Show more…
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