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JEE Mains · Maths · STD 12 - 2. inverse trigonometric function

समीकरण \(\tan^{-1}4x+\tan^{-1}6x=\frac{\pi}{6}\) के हलों की संख्या, जहाँ \(-\frac{1}{2\sqrt{6}}< x <\frac{1}{2\sqrt{6}}\) है, वह ___ है।

  1. A 3
  2. B 0
  3. C 1
  4. D 2
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Answer & Solution

Correct Answer

(C) 1

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Detailed explanation

\(\tan ^{-1} 4 x+\tan ^{-1} 6 x=\frac{\pi}{6}\) \(\Rightarrow \tan ^{-1}\left(\frac{4 x+6 x}{1+24 x^2}\right)=\frac{\pi}{6}\) \(\Rightarrow \frac{10 x}{1-24 x^2}=\frac{1}{\sqrt{3}}\) \(\Rightarrow 24 x^2+10 \sqrt{3} x-1=0\) \(x=\frac{-10 \sqrt{3} \pm \sqrt{300+96}}{48}\)…
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