the range of sin and cos can only in between -1 and 1
Therefore, inverse sin and inverse cos can only take value in between these two values.
For example, we look at 3.
f(x) = inverse cos(1-2x)
For f(x) to be defined,
we must have
-1 <= 1-2x <= 1
-2 <= -2x <= 0
2 >= 2x >= 0
1 >= x >=0...