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Mathematics · 2025 · 1 mark
Inverse Trigonometric FunctionsBasic Concepts of Inverse Trigonometric Functions1 markUnderstandassertion reason
CBSE 2025 · Region 7 · Set 1 · Q20
Assertion (A): Set of values of sec^-1((√ 3)/2) is a null set. Reason ( R ): sec^-1 x is defined for x ∈ R -(-1,1).
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
(A)
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
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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.