sin(x)  cos(x)  cot(x) csc(x) sec(x) tan(x)

asin(x) acos(x) acot(x) acsc(x) asec(x) atan(x) atan(x,y)

sinh(x) cosh(x) coth(x) csch(x) sech(x) tanh(x)

asinh(x) acosh(x) acoth(x) acsch(x) asech(x) atanh(x)

the trigonometric inverses:

hyperbolic functions:

and inverse hyperbolic functions:

will evaluate by default only when the result is an exact value, or when the input x is a floating point number.  Otherwise, for example, when x is a symbolic expression they will remain in function form so that they can be manipulated symbolically by themselves or as part of a larger expression.  

invtrig, MTM[expand], MTM[factor], MTM[simplify], trig