The domain of the function cos-1 (2x – 1) is

[0, 1] [–1, 1] (–1, 1) [0, π]

[0, 1]

cos-1 (2x – 1) ⇒ Let $f(x)=cos^{−1}(2x−1)$ $∵−1≤2x−1≤1$ $⇒0≤2x≤2⇒0≤x≤1$ $∴x∈[0,1]$ Option 1 is correct.