The given expression is
[tex]\cos ^{-1}(\frac{3}{5})[/tex]
This expression is the value of an angle in the 1st quadrant and another value in the 4th quadrant
Then it has only 2 values if the domain is just from 0 to 360 degrees
But if the domain is open from -ve infinity to infinity, then
There are an infinite number of values to the given expression
Then the answer is true
