Maclaurin series of $\arctan(x)$ up to degree $4$
60288
Why is $\arctan(x)=x-x^3/3+x^5/5-x^7/7+\dots$?
104490
Range of $\operatorname{arccot}(x)$
150200
finding $\lim_{n\rightarrow\infty}\sum_{r=1}^{n}\arctan\left(\frac{2r}{1-r^2+r^4}\right)$
141184
Proof that a degree 4 polynomial has at least two roots
53857
Showing $\sup \{ \sin n \mid n\in \mathbb N \} =1$
77821
Taylor series expansion of function $f(x) = \frac{\arcsin(x)}{\sqrt{1-x^2}}$
35439
Does the series $\;\sum\limits_{n=0}^{\infty}\left(\frac{\pi}{2} - \arctan(n)\right)$ converge or diverge?
69803
An elementary proof of $\int_{0}^{1}\frac{\arctan x}{\sqrt{x(1-x^2)}}\,dx = \frac{1}{32}\sqrt{2\pi}\,\Gamma\left(\tfrac{1}{4}\right)^2$
92690
Infinite Series $\sum\limits_{n=0}^{\infty}\arctan(\frac{1}{F_{2n+1}})$
71796
Proving $\rm \frac i 2 \ln\frac {x+i}{x-i}=\arctan x$ .
95108
Alternative form of ArcSin[Sin[x]]
48956
Simplify $\arctan (\frac{1}{2}\tan (2A)) + \arctan (\cot (A)) + \arctan (\cot ^{3}(A)) $
23018
Integral $\int_a^\infty \frac{\arctan(x+b)}{x^2+c}dx$
38489
Degree of the extension $\mathbb{Q}(\sqrt{a+\sqrt{b}})$ over $\mathbb{Q}$
51694
Radius of convergence of a power series with $a_n$ convergent
15330
Double limit of $\cos^{2n}(m! \pi x)$ at rationals and irrationals
31379
Relationship between $\tanh x$ and $\arctan x$