Identify the expression and the inverse trigonometric function involved
Determine the principal range of the inverse trigonometric function
Reduce the given angle or value to an equivalent one within the principal range
Use the principal range to select the unique valid value
For trigonometric equations, apply the inverse function and then adjust to the principal value
For complex numbers, use the principal argument range
For logarithms, use the principal branch if required
Check that the final value lies in the accepted principal interval
Write only the value that satisfies the principal range