& cos() Syntax: cos(<number>) Returns the cosine of <number>, expressed in radians. Examples: > say cos(0) You say "1" > say cos(fdiv(pi(),2)) You say "0" > say cos(fdiv(pi(),4)) You say "0.707107" > say cos(fdiv(pi(),6)) You say "0.866025" See Also: acos(), asin(), atan(), pi(), sin(), tan().