Mark (√) against the correct answer in the following:
Let f(x) = cos - 1(3x – 1). Then, dom (f) = ?
f(x) = cos - 1 (3x - 1).
domain of cos - 1x = [ - 1,1]
on multiplying by an integer the domain decreases by same number
domain of cos - 13x = [ - 1/3,1/3]
domain of cos - 1 (3x - 1) = [1/3 - 1/3,1/3 + 1/3] = [0,2/3]