What are the principal values when solve inverse trig equations?

The domain of y=sinx is [−π2,π2] and the range is [-1, 1].
The domain of y=sin−1 is [-1, 1] and the range is [−π2,π2].
The domain of y=cosx is [0,π] and the range is [-1, 1].
The domain of y=cos−1x is [-1, 1] and the range is [0,π].
The domain of y=tanx is [−π2,π2] and the range is [−∞,∞].
The domain of y=tan−1x is [−∞,∞] and the range is [−π2,π2].

The correct answer would be "convenience"