simplify the following expression

[GeniusAreMade]

Hello everyone, sorry for bothering you but I'm stuck on this question ( I attached the file ) please help me if you can i would be grateful.
the main goal of this exercise is to simplify this function so the arc sin and these strange things disappear.

 

[Steven G]

Suppose y = 2 arctan (sqrt(1+x^2) - x) + arctan(x)

Then y= 2[MATH]\theta _1[/MATH] + [MATH]\theta_2[/MATH] where [MATH]\theta_1 =?\ and\ \theta_2 = ?[/MATH]

 

[GeniusAreMade]

Ohhh I got it, i just remembered that 2arctan(x) is arctan(2x/[1-x^2])....................(edited).................Those parentheses[] are very important
Jomo thanks for your help anyway