I am trying to solve this exercise from a secondary school textbook:
Prove that $\arccos x = \pi/2 - \arctan\bigl(x/\sqrt{1-x^2}\bigr)$ for $-1<x<1$.
I should use Lagrange or Rolle theorem for the demonstration. Any tips?
$\begingroup$
$\endgroup$
1
-
$\begingroup$ Welcome to Mathematics SE. Take a tour. You'll find that simple "Here's the statement of my question, solve it for me" posts will be poorly received. What is better is for you to add context (with an edit): What you understand about the problem, what you've tried so far, etc.; something both to show you are part of the learning experience and to help us guide you to the appropriate help. You can consult this link for further guidance. $\endgroup$– Another UserNov 20 at 18:37
Add a comment
|