CBSE 2023 · Region 4 · Set 3 · Q6 · 1 mark
The product $\displaystyle \left[\begin{array}{cc}\mathrm{a} & \mathrm{b} \\ -\mathrm{b} & \mathrm{a}\end{array}\right]\left[\begin{array}{cc}\mathrm{a} & -\mathrm{b} \\ \mathrm{b} & \mathrm{a}\end{array}\right]$ is equal to :
Official answer
From CBSE’s own marking scheme for this paper.
(A)
$\displaystyle \left[\begin{array}{cc}\mathrm{a}^{2}+\mathrm{b}^{2} & 0 \\ 0 & \mathrm{a}^{2}+\mathrm{b}^{2}\end{array}\right]$
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CBSE Class 12 Mathematics past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.