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Lim X → 1 − Cos 2 X X I S

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Question

\[\lim_{x \to  } \frac{1 - \cos 2x}{x} is\]

Options

  • (a) 0 

  • (b) 1 

  • (c) 2 

  • (d) 4 

MCQ
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Solution

\[\lim_{x \to 0} \frac{1 - \cos 2x}{x}\]
\[ = \lim_{x \to 0} \frac{2 \sin^2 x}{x}\]
\[ = \lim_{x \to 0} 2x \times \frac{\sin^2 x}{x^2}\]
\[ \Rightarrow 0\] 

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Chapter 29: Limits - Exercise 29.13 [Page 78]

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R.D. Sharma Mathematics [English] Class 11
Chapter 29 Limits
Exercise 29.13 | Q 4 | Page 78

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