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Using small-angle behaviour, (tan 2x − sin 2x)/x³ approaches what at x = 0?
A2
B1
C4
D8
Answer & Solution
Correct answer: C. 4
tan 2x − sin 2x = tan 2x (1 − cos 2x), which behaves like 2x · 2x² = 4x³ near 0.
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