How is the domain of a trigonometric function restricted so that its inverse function is defined? Drag a phrase or interval into each box to correctly complete the statements. The graph of f (x) = cos x Therefore, a domain restriction must be placed on the function for the inverse function to be defined. The domain restriction placed on f (x) = COS X is so that its inverse function is defined. does not pass the vertical line test does not pass the horizontal line test is one-to-one (- 2 ' 2 (0, (0, IT) [0, = ] [0, TT]