alleryThe value of $\displaystyle\lim_{x\to 0}\frac{1-\cos x}{x}$ is:
A1
B$\tfrac12$
C$\infty$
D0
Answer & Solution
Correct answer: D. 0
(1−cos x)/x → 0 as x→0 (numerator ~ x²/2, denominator x).
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