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Mathematics · 2026 · 1 mark
CBSE 2026 · Region 3 · Set 3 · Q12
If 2 cos^-1 x = y, then dy/dx is:
If $\displaystyle 2 \cos^{-1} x = y$, then $\displaystyle \dfrac{dy}{dx}$ is :
Official answer
(D)
$\displaystyle -2 \operatorname{cosec} \dfrac{y}{2}$
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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.