MHT CET · Maths · Limits
\(\lim _{x \rightarrow 0} \frac{\sin ^2 x}{\sqrt{2}-\sqrt{1+\cos x}}\) equals
- A \(\sqrt{2}\)
- B \(4 \sqrt{2}\)
- C \(2 \sqrt{2}\)
- D \(4\)
Answer & Solution
Correct Answer
(B) \(4 \sqrt{2}\)
Step-by-step Solution
Detailed explanation
\(\begin{aligned} & \lim _{x \rightarrow 0} \frac{\sin ^2 x}{\sqrt{2}-\sqrt{1+\cos x}}=\lim _{x \rightarrow 0} \frac{\sin ^2 x\{\sqrt{2}+\sqrt{1+\cos x}\}}{2-(1+\cos x)} \\ & =\lim _{x \rightarrow 0} \frac{(1-\cos x)(1+\cos x)(\sqrt{2}+\sqrt{1+\cos x})}{1-\cos x} \\ & =(1+\cos 0)(\sqrt{2}+\sqrt{1+\cos 0}) \\ & =2 \times 2 \sqrt{2} \\ & =4 \sqrt{2}\end{aligned}\)
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