What is ?
Answer and explanation
Correct answer: C.
- Step 1: Direct substitution yields indeterminate form .
- Step 2: Apply L'Hopital's rule: .
Answer
.
Why not the others: inverts the ratio of coefficients; assumes all trigonometric limits cancel to unity; and incorrectly multiplies rather than divides the leading coefficients.
Practise more Differentiation.
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