cos(p1)
Computes the cosine of x (expressed in radians). Returns -1..1.
/* * call-seq: * Math.cos(x) => float * * Computes the cosine of <i>x</i> (expressed in radians). Returns * -1..1. */ static VALUE math_cos(obj, x) VALUE obj, x; { Need_Float(x); return rb_float_new(cos(RFLOAT(x)->value)); }