ReferenceFunctionsNumeric FunctionsCOS本页总览COSReturns the cosine of x, where x is given in radians.SyntaxCOS(x)ArgumentsArgumentsDescriptionxThe angle, in radians.Return TypeA Float64 data type value.ExamplesSELECT COS(PI());+-----------+| COS(PI()) |+-----------+| -1 |+-----------+