If 2 \cos ^{-1} x=y, then

CBSE Class 12 Math 2026 All Sets Solved Paper

Question : 1 of 20

Marks: +1, -0

2 \cos ^{-1} x=y

, then

Solution:

\cos ^{-1} x ∈[0, π]

2 \cos ^{-1} x ∈[0,2 π]

and

y=2 \cos ^{-1} x

⇒ y ∈[0,2 π]

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