Can I equate the solutions $\arcsin\frac{x^2+y^2-a^2/2}{a^2/2}=2\arctan\frac{y}{x}+C$ to $\arcsin\frac{\sqrt{x^2+y^2}}{a}=\arctan\frac{y}{x}+C$
61105
solve$\frac{xdx+ydy}{xdy-ydx}=\sqrt{\frac{a^2-x^2-y^2}{x^2+y^2}}$
127284
Closed form of $\int_0^{\pi/2} \frac{\arctan^2 (\sin^2 \theta)}{\sin^2 \theta}\,d\theta$
94700
Integer solutions for $x^3+2=y^2$?
109887
How to evaluate $\int_0^1 (\arctan x)^2 \ln(\frac{1+x^2}{2x^2}) dx$
145521
Why does $\arctan(x)= \frac{1}{2i}\log \left( \frac{x-i}{x+i}\right)+k$?
49443
What is the value of $\arctan(1/2)+\arctan(1/5)+\arctan(1/8)$?
82170
Solve $x = \frac{1}{2}\tan(x)$
147113
How to solve $2 \tan x / (1 - (\tan x)^2) = (\sin 2x)^2$?
128258
Why aren't the graphs of $\sin(\arcsin x)$ and $\arcsin(\sin x)$ the same?
71796
Proving $\rm \frac i 2 \ln\frac {x+i}{x-i}=\arctan x$ .
18903
Finding solutions to equation of the form $1+x+x^{2} + \cdots + x^{m} = y^{n}$
24391
$\arcsin$ written as $\sin^{-1}(x)$
88760
Find the integral solutions to $ x^2+y^2+z^2=x^2y^2$
1859
Proving $\arctan(\sqrt{x^2+1}-x)=\frac{\pi}{4}-\frac{1}{2}\arctan(x)$
44059
Evaluating $\int_{-1}^{1}\frac{\arctan{x}}{1+x}\ln{\left(\frac{1+x^2}{2}\right)}dx$
61022
Diophantine Equations : Solving $a^2+ b^2=2c^2$
137015
Solutions for $a^2+b^2+c^2=d^2$