CBSE 2023 · Region 3 · Set 1 · Q16 · 1 mark
If $\displaystyle y=\frac{\cos \mathrm{x}-\sin \mathrm{x}}{\cos \mathrm{x}+\sin \mathrm{x}}$, then $\displaystyle \frac{d y}{d \mathrm{x}}$ is :
Official answer
From CBSE’s own marking scheme for this paper.
(A)
$\displaystyle -\sec ^{2}\left(\frac{\pi}{4}-\mathrm{x}\right)$
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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.