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CBSE Class 12 Math 2026 All Sets Solved Paper

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Question : 1 of 20
Marks: +1, -0
If 2cos⁡−1x=y2 \cos^{-1} x = y, then
Solution:  
cos⁡−1x∈[0,π]\cos^{-1} x \in [0, \pi]
2cos⁡−1x∈[0,2π]2 \cos^{-1} x \in [0, 2\pi]
and y=2cos⁡−1xy = 2 \cos^{-1} x
⇒y∈[0,2π]\Rightarrow y \in [0, 2\pi]
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