Do you have to type a sine problem in Desmos, where the output is undefined? By converting it to exact form, you unlock the door to opening up the problem and getting a defined answer.
Use these key commands:
Hit “e” to move the cursor
Type “pi” with the Greek keyboard
Type the fraction command with “/”
Utilize the exponent command with “^”
Input all the angles in radians
Follow the PEMDAS order of operations