sin
radians => number
cos
radians => number
tan
radians => number
radians--a number given in radians.
number--a number.
sin, cos, and tan return the sine, cosine, and tangent, respectively, of radians.
(sin 0) => 0.0 (cos 0.7853982) => 0.707107 (tan #c(0 1)) => #C(0.0 0.761594)
Should signal an error of type type-error if radians is not a number. Might signal arithmetic-error.