If the input to the x function is 1, what is the output in radian?

Which of the following is not in the principal range of the x function? 

If the input to the x function is - √5 what is the output in radian?

If the input to the x function is -1 , what is the output in radian?

Find the range of value 2x

The range of value 0.866 lies in :

Range of θ function in degrees.

Graph of x is symmetric about

Graph of x lies in quadrant

x is a function which is: