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JEE Mains · Maths · STD 12 - 3 and 4 . metrices and determinant

यदि समीकरण निकाय \( x+(\sqrt{2} \sin \alpha) y+(\sqrt{2} \cos \alpha) z=0 \) \( x+(\cos \alpha) y+(\sin \alpha) z=0 \) \( x+(\sin \alpha) y-(\cos \alpha) z=0\) का एक अतुच्छ हल है, तो \(\alpha \in\left(0, \frac{\pi}{2}\right)\) = ........... है।

  1. A  \(\frac{3 \pi}{4}\)
  2. B  \(\frac{7 \pi}{24}\)
  3. C  \(\frac{5 \pi}{24}\)
  4. D  \(\frac{11 \pi}{24}\)
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Answer & Solution

Correct Answer

(C)  \(\frac{5 \pi}{24}\)

Step-by-step Solution

Detailed explanation

\(\left|\begin{array}{ccc}1 & \sqrt{2} \sin \alpha & \sqrt{2} \cos \alpha \\ 1 & \sin \alpha & -\cos \alpha \\ 1 & \cos \alpha & \sin \alpha\end{array}\right|=0\) \( \Rightarrow 1-\sqrt{2} \sin \alpha(\sin \alpha+\cos \alpha)+\sqrt{2} \cos \alpha(\cos \alpha-\sin \alpha)=0 \)…
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