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Mathematics · 2026 · 1 mark
CBSE 2026 · Region 2 · Set 3 · Q8
If A = [tan x, cot x; - cot x, tan x] and A + A^′=2 I, then value of x ∈[0, (π)/2] is
If $\displaystyle \mathrm{A}=\left[\begin{array}{cc}\tan x & \cot x \\ -\cot x & \tan x\end{array}\right]$ and $\displaystyle \mathrm{A}+\mathrm{A}^{\prime}=2 \mathrm{I}$, then value of $\displaystyle x \in\left[0, \frac{\pi}{2}\right]$ is
Official answer
(C)
$\displaystyle \frac{\pi}{4}$
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CBSE Class 12 Mathematics past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.