The math help thread

So, I finally understood how to do that question (though i messed that up for the assignment)

I'm suppose to rearrange the equation into
arcsin ((x-1)/(x+1))-2arctan(sqrt(x))-(pi/2)=0
then let f(x)=arcsin ((x-1)/(x+1))-2arctan(sqrt(x))-(pi/2)
take the derivate, and f '(x)=0
since f '(x)=0 that means f(x) is a constant for all value of x, plug in any number for f(x) and it =0.

Not bad, not bad at all.

(However, you cannot plug in all values of x. x = -1 makes bad stuff here. Though, it's maybe obvious that it's in the interval (-1, 1))

Noah