# Math Help - Recomposing trig and hyp functions

1. ## Recomposing trig and hyp functions

Hello!

I have a question dealing with expressions of the form:

arcsin(cosx) , arsinh(coshx) - How do you recompose them?

Can one recompose expressions of hte form arsinh(cosx) and arcsin(coshx) without using complex numbers?

I'm interested in a general method, not only in these specific examples

2. Right Triangles

3. but the hyp. functions are not defined via triangles.. ?

4. True enough, but their algebraic relationships are sufficiently similar.

5. Originally Posted by TKHunny
True enough, but their algebraic relationships are sufficiently similar.
ok, but how this fact is gonna help me find arccosh(sinhx)?

I'm really stuck in here