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SIN returns the sine of the angle x given in radians.
 
SIN(x)
    ■ The argument x can be of any numeric type.
 
Usage Notes
    ■ The sine of an angle in a right triangle is the ratio between the
      length of the side opposite the angle and the length of the
      hypotenuse.
    ■ SIN is calculated in single precision if the argument x is an
      integer or single-precision value. If you use any other numeric data
      type, SIN is calculated in double-precision.
    ■ To convert values from degrees to radians, multiply the angle
      (in degrees) times PI/180 (or .0174532925199433) where PI = 3.141593.
    ■ To convert a radian value to degrees, multiply it by 180/PI
      (or 57.2957795130824) where PI = 3.141593.