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JEE Mains · Maths · STD 11 - Trigonometrical equations

यदि समीकरण \(4 \cos \theta+5 \sin \theta=1\). का हल \(\alpha,-\frac{\pi}{2}<\alpha<\frac{\pi}{2}\) है, तो \(\tan \alpha\) का मान ........... है।

  1. A \(\frac{10-\sqrt{10}}{6}\)
  2. B  \(\frac{10-\sqrt{10}}{12}\)
  3. C  \(\frac{\sqrt{10}-10}{12}\)
  4. D \(\frac{\sqrt{10}-10}{6}\)
Verified Solution

Answer & Solution

Correct Answer

(C)  \(\frac{\sqrt{10}-10}{12}\)

Step-by-step Solution

Detailed explanation

\(4+5 \tan \theta=\sec \theta\) Squaring : \(24 \tan ^2 \theta+40 \tan \theta+15=0\) \(\tan \theta=\frac{-10 \pm \sqrt{10}}{12}\) and \(\tan \theta=-\left(\frac{10+\sqrt{10}}{12}\right)\) is Rejected. \((3)\) is correct.
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