Class CBSE Class 12 Mathematics Inverse Trigonometric Functions Q #1673
COMPETENCY BASED
APPLY
1 Marks 2026 AISSCE(Board Exam) MCQ SINGLE
The following graph represents:
(A) $y=\cos^{-1}x$
(B) $y=\sec^{-1}x$
(C) $y=\tan^{-1}x$
(D) $y=\text{cosec}^{-1}x$

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Detailed Solution

Step 1: Analyze the Domain and Range

The graph of an inverse trigonometric function is defined by its specific domain and range. For the given options, we observe the behavior of the function as $x$ approaches infinity and the values it takes near the origin.

Step 2: Evaluate the Options

The function $y = \tan^{-1}x$ is defined for all real numbers $x \in (-\infty, \infty)$ and its range is $(-\pi/2, \pi/2)$. The graph passes through the origin $(0,0)$ and is strictly increasing. The functions $y = \cos^{-1}x$, $y = \sec^{-1}x$, and $y = \text{cosec}^{-1}x$ have restricted domains (e.g., $[-1, 1]$ for $\cos^{-1}x$ and $(-\infty, -1] \cup [1, \infty)$ for $\sec^{-1}x$ and $\text{cosec}^{-1}x$), which do not match the continuous curve passing through the origin typically associated with $\tan^{-1}x$.

Step 3: Conclusion

Based on the standard graphical representation of inverse trigonometric functions in the CBSE curriculum, the curve passing through the origin with horizontal asymptotes at $y = \pi/2$ and $y = -\pi/2$ corresponds to $y = \tan^{-1}x$.

Final Answer: C

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Pedagogical Audit
Bloom's Analysis: This is an APPLY question because the student must apply their knowledge of the graphical properties of inverse trigonometric functions to identify the correct function from a visual representation.
Knowledge Dimension: CONCEPTUAL
Justification: The question tests the understanding of the relationship between algebraic definitions and their geometric manifestations (graphs).
Syllabus Audit: In the context of CBSE Class 12, this is classified as COMPETENCY. It requires visual literacy and the ability to distinguish between different inverse trigonometric functions based on their domain, range, and asymptotic behavior.