Supplied Functions（Constant or else） ☆☆

Constant

PI

An approximate value of the ratio of the circumference of a circle to its diameter π=3.141592....
<Note> PI is a reserved word.

Conversion of the unit of angles

DEG(x)    x*180/π
RAD(x)    x*π/180

Others

MAX(a,b)  The larger of a and b
MIN(a,b)  The smaller of a and b