asin()

Returns the arcsine (inverse sine) of the given value in radians.

asin(value)

• The arcsine of the given value in radians.
• Returns None if the input is outside the range [-1, 1].

asin(0);     // returns 0

asin(1);     // returns pi()/2

asin(-1);    // returns -pi()/2

pi
sin
asin
cos
acos
tan
atan
atan2
rad2deg
deg2rad