Trigonometrical Functions

acos( )                -        Calculate arccosine

acosh( )        -        Hyperbolic arccosine

asin( )                -        Calculate arcsine

asinh( )        -        Hyperbolic arcsine

atan( )                -        Calculate arctangent

atanh( )        -        Hyperbolic arctangent

cos( )                -        Calculate cosine (angle is in degrees)

rcos( )                -        Calculate cosine (angle is in radians)

rsin( )                -        Calculate sine (angle is in radians)

rtan( )                -        Calculate tangent (angle is in radians)

racos( )        -        Calculate arccosine (angle is in radians)

rasin( )                -        Calculate arcsine (angle is in radians)

ratan( )        -        Calculate arctangent (angle is in radians)        

sin( )                -        Calculate sine (angle is in degrees)        

tan( )                -        Calculate tangent (angle is in degrees)

All functions have one real argument. Any expression (including function calls) can be used in function arguments, the result of which must be a real number.