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TS EAMCET · Maths · Limits

\(\lim _{x \rightarrow 0} \frac{\sqrt{\cos x}-\sqrt[3]{\cos x}}{\sin ^2 x}=\)

  1. A \(\frac{1}{2}\)
  2. B \(-\frac{1}{12}\)
  3. C \(-\frac{1}{6}\)
  4. D \(\frac{2}{3}\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(-\frac{1}{12}\)

Step-by-step Solution

Detailed explanation

\( \lim _{x \rightarrow 0} \frac{\frac{d}{dx}(\cos^{1/2} x - \cos^{1/3} x)}{\frac{d}{dx}(\sin ^2 x)} \) \( = \lim _{x \rightarrow 0} \frac{-\frac{1}{2}\sin x (\cos x)^{-1/2} + \frac{1}{3}\sin x (\cos x)^{-2/3}}{2\sin x \cos x} \)…