JavaScript must be enabled in order to use this site. Please enable JavaScript in your browser and refresh the page. xpress.cos xpress.cos Purpose Returns the cosine of a given expression. Synopsis a = xpress.cos(t) Argument t Argument of the cosine function. Further information Using Python's math library operator math.cos is only advisable when the argument is not an expression that depends on variables. Related topics xpress.sin, xpress.tan, xpress.asin, xpress.acos, xpress.atan. Parent Topic Reference Manual