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Problem 7 - Entrance Test
Evaluate lim x→0 (sin x - x)/x^3.
A. -1/6
B. -1/3
C. 0
D. 1/6
Check Answer
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Correct: A
Use Taylor series: sin x = x - x^3/6 + O(x^5). Then (sin x - x)/x^3 = (-x^3/6)/x^3 = -1/6.