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Mathematics · 2026 · 1 mark
CBSE 2026 · Region 2 · Set 1 · Q7
If e^-x+ e^- y =2, then dy/dx is
If $\displaystyle \mathrm{e}^{-x}+\mathrm{e}^{-\mathrm{y}}=2$, then $\displaystyle \frac{\mathrm{dy}}{\mathrm{dx}}$ is
Official answer
(D)
$\displaystyle -\mathrm{e}^{\mathrm{y}-x}$
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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.