CBSE 2025 · Region 7 · Set 1 · Q20 · 1 mark
Assertion (A) : Set of values of $\displaystyle \sec ^{-1}\left(\frac{\sqrt{3}}{2}\right)$ is a null set. Reason $\displaystyle (\mathrm{R}): \quad \sec ^{-1} \mathrm{x}$ is defined for $\displaystyle \mathrm{x} \in \mathrm{R}-(-1,1)$.
Official answer
From CBSE’s own marking scheme for this paper.
(A)
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
Inverse Trigonometric FunctionsBasic Concepts of Inverse Trigonometric FunctionsUnderstandassertion_reasoneasy
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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.