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AP EAMCET · Maths · Limits

\(\lim _{x \rightarrow 0} \frac{x \tan 2 x-2 x \tan x}{(1-\cos 2 x)^2}=\)

  1. A \(-\frac{1}{2}\)
  2. B \(\frac{1}{2}\)
  3. C \(\frac{1}{4}\)
  4. D \(1\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(\frac{1}{2}\)

Step-by-step Solution

Detailed explanation

\( 1-\cos 2x = 2\sin^2 x \) \( (1-\cos 2x)^2 = (2\sin^2 x)^2 = 4\sin^4 x \) \( \text{Using } \sin x \sim x \text{ as } x \to 0: \quad 4\sin^4 x \sim 4x^4 \) \( \text{Using Taylor expansion } \tan u = u + \frac{u^3}{3} + O(u^5) \)…
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