Inverse Trigonometric Functions
NCERT Exemplar Class 12
CBSE
Grade 12
Question:
Find the domain of $f(x) = \cos^{-1}(3x - 2)$.
Step-by-Step Solution
-1 \le 3x-2 \le 1 \Rightarrow 1 \le 3x \le 3. [1.0 Mark]
Domain $= [1/3, 1]$. [1.0 Mark]
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🎯 Official CBSE Marking Scheme:
Setting up domain inequality: 1.0 Mark
Evaluating domain $[1/3, 1]$: 1.0 Mark
Correct Answer:
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