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Mathematics · 2026 · 1 mark
CBSE 2026 · Region 1 · Set 1 · Q5
One of the values of x for which |cos x, sin x; - cos x, sin x| =1 is
One of the values of $\displaystyle x$ for which $\displaystyle \left|\begin{array}{cc}\cos x & \sin x \\ -\cos x & \sin x\end{array}\right|=1$ is
Official answer
(B)
$\displaystyle \frac{\pi}{4}$
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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.