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Question 21

Mathematics Limit of Functions Hard

What is the value of \(\rm \displaystyle \lim_{x \to 0} {x^2}{e^{\sin \left( {\tfrac{1}{x}} \right)}}\)</span>?

(A) 1
(B) The limit does not exist.
(C) &infin;
(D) None of these.
✓ Correct Answer: Option D Verified Solution

📘 Step-by-Step Solution & Detailed Explanation:

We know that: \[ -1 \leq \sin\left(\frac{1}{x}\right) \leq 1, \] which implies: \[ e^{-1} \leq e^{\sin\left(\frac{1}{x}\right)} \leq e^1. \] Multiplying through by \( x^2 \), where \( x^2 \geq 0 \): \[ x^2 e^{-1} \leq x^2 e^{\sin\left(\frac{1}{x}\right)} \leq x^2 e^1. \] Taking the limit as \( x \to 0 \): \[ \lim_{x \to 0} x^2 e^{-1} = 0, \quad \lim_{x \to 0} x^2 e^1 = 0. \] By the Squeeze Theorem: \[ \lim_{x \to 0} x^2 e^{\sin\left(\frac{1}{x}\right)} = 0. \] Thus: \[ \lim_{x \to 0} x^2 e^{\sin\left(\frac{1}{x}\right)} = 0. \]

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