- #1

raul_l

- 105

- 0

Are there any addition theorems for inverse trigonometric functions?

Like arccos(x+y)=? or something...

I was wondering about this when I tried to find the derivative of f(x)=arccos(x) by setting

[tex] f'(x)=\frac{\arccos(x+\Delta x)-\arccos(x)}{\Delta x}[/tex]