Correct Answer is (B) [-1, 1]
Here,the inverse function of cos is given by y = f-1(x)
The graph of the function y = cos-1(x) can be obtained from the graph of
Y = cos x by interchanging x and y axes.i.e, if (a,b) is a point on Y = cos x then (b,a) is the point on the function y = cos-1(x)
Below is the Graph of the domain of cos-1(x)
From the graph, it is clear that the domain of cos-1(x) is [-1,1]
