Find $\arctan(x) + \arctan(y)$ in terms of $\arctan((x + y)/(1 - xy))$
25065
What is $\arctan(x) + \arctan(y)$
71796
Proving $\rm \frac i 2 \ln\frac {x+i}{x-i}=\arctan x$ .
93365
Solutions of $\arctan x = 1 - x$. Proofs?
150200
finding $\lim_{n\rightarrow\infty}\sum_{r=1}^{n}\arctan\left(\frac{2r}{1-r^2+r^4}\right)$
48956
Simplify $\arctan (\frac{1}{2}\tan (2A)) + \arctan (\cot (A)) + \arctan (\cot ^{3}(A)) $
139022
Solve For X inside arc-cos function (with division)
11059
Verify the identity: $\tan^{-1} x +\tan^{-1} (1/x) = \pi /2$
23397
Why it's true? $\arcsin(x) +\arccos(x) = \frac{\pi}{2}$
24391
$\arcsin$ written as $\sin^{-1}(x)$
24234
How to evaluate $\lim_{x\to\infty}\arctan (4/x)/ |\arcsin (-3/x)|$?
1859
Proving $\arctan(\sqrt{x^2+1}-x)=\frac{\pi}{4}-\frac{1}{2}\arctan(x)$
142835
Proving :$\arctan(1)+\arctan(2)+ \arctan(3)=\pi$
33791
Is it generally true that $\arcsin \theta + \arccos \theta = \frac{\pi}{2}$?
125171
Help with this trigonometry problem?
142365
Use of substitution into the integral $\int_0^2 \frac{\arctan x}{x^2+2x+2}dx$
79040
Graph of $|x| + |y| = 1$
49211
Solving $f(x+y) = f(x)f(y)f(xy)$