lingo中怎么表示反三角函数例如要表示y=arc cos(x)

@ACOS( X)
Returns the inverse cosine,or arccosine,of X,where X is an angle in radians.
@ACOSH( X)
Returns the inverse hyperbolic cosine of X,where X is an angle in radians.
@ASIN( X)
Returns the inverse sine,or arcsine,of X,where X is an angle in radians.
@ASINH( X)
Returns the inverse hyperbolic sine of X,where X is an angle in radians.
@ATAN( X)
Returns the inverse tangent,or arctangent,of X,where X is an angle in radians.
@ATAN2( Y,X)
Returns the inverse tangent of Y/X.
@ATANH( X)
Returns the inverse hyperbolic tangent of X,where X is an angle in radians.