🛠️ JEE➗ Maths

Let \(R=\left(\begin{array}{ccc}x & 0 & 0 \\ 0 & y & 0 \\ 0 & 0 & z\end{array}\right)\) be a non…

Q1

Let \(R=\left(\begin{array}{ccc}x & 0 & 0 \\ 0 & y & 0 \\ 0 & 0 & z\end{array}\right)\) be a non-zero \(3 \times 3\) matrix, where \(x \sin \theta=y \sin \left(\theta+\frac{2 \pi}{3}\right)=z \sin \left(\theta+\frac{4 \pi}{3}\right) \neq 0, \theta \in(0,2 \pi)\). For a square matrix \(M\), let trace \((M)\) denote the sum of all the diagonal entries of \(M\). Then, among the statements:
(I) \(\operatorname{Trace}(R)=0\)
(II) If trace \((\operatorname{adj}(\operatorname{adj}(R))=0\), then \(R\) has exactly one non-zero entry.

[JEE Main 2024, 30 Jan (Shift 2)]

a

Neither (I) nor (II) is true

b

Only (II) is true

c

Both (I) and (II) are true

d

Only (I) is true

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