CBSE 2025 · Region 4 · Set 1 · Q5 · 1 mark
The values of $\displaystyle \lambda$ so that $\displaystyle f(x)=\sin x-\cos x-\lambda x+C$ decreases for all real values of x are :
Official answer
From CBSE’s own marking scheme for this paper.
(C)
$\displaystyle \lambda \geq \sqrt{2}$
Application of DerivativesIncreasing and Decreasing FunctionsApplymcqmedium
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CBSE Class 12 Mathematics past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.