Atan(6/10)+Atan(1/4)=Pi/4
104453
A question about the arctangent addition formula.
43659
Why is $\pi$ so close to $3$?
66872
Exact values of $\cos(2\pi/7)$ and $\sin(2\pi/7)$
55680
The relationship of ${\frak m+m=m}$ to AC
127284
Closed form of $\int_0^{\pi/2} \frac{\arctan^2 (\sin^2 \theta)}{\sin^2 \theta}\,d\theta$
617
Find θ: $β=\arctan\frac{(R+r)·\sin(θ)-r·\sin(θ(1+\frac{R}{r}))}{(R+r)·\cos(θ)-r·\cos(θ(1+\frac{R}{r}))}$
68881
Solve for $\theta$: $a = b\tan\theta - \frac{c}{\cos\theta}$
49443
What is the value of $\arctan(1/2)+\arctan(1/5)+\arctan(1/8)$?
140342
$\frac {1}{5}-\frac{1.4}{5.10}+\frac{1.4.7}{5.10.15}-\cdot\cdot\cdot\cdot\cdot\cdot\cdot$
25065
What is $\arctan(x) + \arctan(y)$
148207
Express $\cos 6\theta $ in terms of $\cos \theta$
55128
Evaluation of $\sin \frac{\pi}{7}\cdot \sin \frac{2\pi}{7}\cdot \sin \frac{3\pi}{7}$
103144
Is there a way to write this expression differently: $\arctan 1/(1+n+n^2)$?
95145
Does $\exp(2ir\pi)$ equal $1$? What's wrong?
24656
Proving that $\frac{\csc\theta}{\cot\theta}-\frac{\cot\theta}{\csc\theta}=\tan\theta\sin\theta$
131168
Minimizing $\cot^2 A +\cot^2 B + \cot^2 C$ for $A+B+C=\pi$
119815
Why is $\tan((1/2)\pi)$ undefined?