Normally, when the calculator is in radian mode, the trigonometric functions only return values calculated in radians. With the ° symbol you can have the angle evaluated as if in degree mode because it converts the angle into radians.
One full rotation around a circle is 2π radians, which is equal to 360°. To convert an angle in radians to degrees you multiply by 180/π, and to convert from degrees to radians multiply by π/180.
In radian mode:
sin(45) \\ actually calculating sin(2578.31) .8509035245 sin(45°) .7071067812
In degree mode:
sin(45) .7071067812 sin(45°) .7071067812 \\ There's no difference when in degrees
When you only call the trig function once in a program and want it calculated in degrees, instead of changing the mode you can just use ° to save one-byte (the newline from using the command Degree)
:Degree :sin(X) can be :sin(X°)
- r (radian symbol)