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

माना \(f(x)=\left|\begin{array}{ccc}\sin ^{2} x & -2+\cos ^{2} x & \cos 2 x \\ 2+\sin ^{2} x & \cos ^{2} x & \cos 2 x \\ \sin ^{2} x & \cos ^{2} x & 1+\cos 2 x\end{array}\right|, x \in[0, \pi]\)है, तो \(f ( x )\) का अधिकतम मान बराबर है .............|

  1. A \(6\)
  2. B \(7\)
  3. C \(8\)
  4. D \(9\)
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Answer & Solution

Correct Answer

(A) \(6\)

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Detailed explanation

\(\left| {\begin{array}{*{20}{c}} { - 2}&{ - 2}&0 \\ 2&0&{ - 1} \\ {{{\sin }^2}x}&{{{\cos }^2}x}&{1 + \cos 2x} \end{array}} \right| (\mathrm{R}_{1} \rightarrow \mathrm{R}_{1}-\mathrm{R}_{2} \,and \,\mathrm{R}_{2} \rightarrow \mathrm{R}_{2}-\mathrm{R}_{3})\)…
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