The "Standard trigonometric functions" is right, but the "x is in radians" part is true just for the last three functions (Cos(x), Sin(x), Tan(x)). The argument of the Atan(x), Asin(x), Acos(x) functions are not angles (neither in degrees, neither in radians), but numbers. More than this, the argument of the Asin(x) and Acos(x) functions must be between -1 and 1. The result of the Atan(x), Asin(x), Acos(x) functions are indeed expressed into radians.Standard trigonometric functions. x is in radians.

Eg the Asin(10) will give an error, because as I said, the argument of the Asin (and Acos) function(s) must be between -1 and 1. Asin(0.5) works well.

Please check and if I'm right, fix the help.

Thanks.