Assertion (A): Domain of y = cos^-1(x) is [-1,1]. Reason (R): The range of the principal value branch of y = cos^-1(x) is [0, π]-{(π)/2}

Assertion (A) : Domain of $\displaystyle \mathrm{y}=\cos ^{-1}(x)$ is $\displaystyle [-1,1]$. Reason (R) : The range of the principal value branch of $\displaystyle \mathrm{y}=\cos ^{-1}(x)$ is \[[0, \pi]-\left\{\frac{\pi}{2}\right\} \]