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Mathematics · 2025 · 1 mark
CBSE 2025 · Region 6 · Set 1 · Q8
If y = a cos ( log x )+ b sin ( log x ), then x^2 y_2+ xy_1 is:
If $\displaystyle \mathrm{y}=\mathrm{a} \cos (\log \mathrm{x})+\mathrm{b} \sin (\log \mathrm{x})$, then $\displaystyle \mathrm{x}^{2} \mathrm{y}_{2}+\mathrm{xy}_{1}$ is :
Official answer
(C)
$\displaystyle -\mathrm{y}$
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CBSE Class 12 Mathematics past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.