MCQ
$\lim _{x \rightarrow \infty} \frac{\sin x}{x}=$
  • A
    $2$
  • B
    $1$
  • C
    $\infty$
  • $0$

Answer

Correct option: D.
$0$
Explanation: $\lim _{x \rightarrow \infty} \frac{\sin x}{x}$
$\text { Let } x=\frac{1}{y}$
$x \rightarrow \infty$
$\therefore y \rightarrow 0$
$=\underset{{y \rightarrow 0}}{\lim} \frac{\sin \frac{1}{y}}{\frac{1}{y}}$
$=\underset{{y \rightarrow 0}}{\lim} y \sin \frac{1}{y}$
$=\underset{{y \rightarrow 0}}{\lim} y \times \underset{{y \rightarrow 0}}{\lim} \sin \frac{1}{y}$
$=0 \times \underset{{y \rightarrow 0}}{\lim} \sin \frac{1}{y}$
$=0$

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