What makes a scientific calculator scientific? Trig functions! Well, they're all here in TouchRPN. To get access to
trigonometric functionality, hit 
and then
. You now can see the trig menu:
From here, click any of the function buttons (for sine, cosine, hyperbolic sine, etc) to do that operation on the bottom
stack element. The constants 
(the imaginary number)
and 
push the respective constants on to the stack.
Because of the mathematical nature of trig functions, they only do calculations in radians. However, you can use degrees
by simply appending the degrees symbol to the number by pressing
, and then doing the function.
TouchRPN will automatically convert to radians before doing the trig function.
gives all of the inverses for all of
the functions available.