CBSE 2026 · Region 5 · Set 1 · Q8 · 1 mark
Derivative of $\displaystyle \cos ^{-1}\left(\frac{\sin \mathrm{x}+\cos \mathrm{x}}{\sqrt{2}}\right),-\frac{\pi}{4}<\mathrm{x}<\frac{\pi}{4}$ with respect to x is :
Official answer
From CBSE’s own marking scheme for this paper.
(A)
$\displaystyle - 1$
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CBSE Class 12 Mathematics past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.