ACS( n )
This function returns the arc cosine of the number or numeric expression n. The return value is expressed in radians.
ASN( n )
This function returns the arc sine of the number or numeric expression n.  The return value is expressed in radians.
ATN( n )
This function returns the arc tangent of the number or numeric expression n.  The return value is expressed in radians.
COS( n )
This function returns the cosine of the angle n.  The angle n should be expressed in radians.
SIN( n )
This function returns the sine of the angle n.  The angle n should be expressed in radians.
TAN( n )
This function returns the tangent of the angle n.  The angle n should be expressed in radians


 