Let $l_1$ and $l_2$ be the lengths of perpendicular chords of $y^2=4ax$ drawn through the vertex and ...
134129
Perpendicular Chord parabola
79040
Graph of $|x| + |y| = 1$
85339
Arc length of general polynomial
154841
Computing symmetry/combinatorial factor for a diagram in $\phi^4$ theory
15287
Proving that second derivative is perpendicular to curve
104828
Show that $\cot \frac{\pi}{2m}\cot \frac{2\pi}{2m}\cot \frac{3\pi}{2m}...\cot \frac{(m-1)\pi}{2m}=1$
58508
Number of ways to pair off $2n$ points such that no chords intersect
95379
Prove that $V = V_1 \oplus V_2$ in the following
106327
Prove, in this figure, that $EFGH$ is a parallelogram
114795
Closed form for the area of a convex cyclic n-gon, given the set of edge lengths
127701
How many distinct ways are there to $2$-color the $8$ vertices of a cube?
55621
Show that if $c_1, c_2, \ldots, c_{\phi(m)}$ is a reduced residue system modulo m, $m \neq 2$ then $c_1 + \cdots+ c_{\phi(m)} \equiv 0 \pmod{m}$
83119
Compass-and-straightedge construction of the square root of a given line?
135469
Showing Equality of Winding Numbers
10424
Review of a proof for De Moivre's theorem using mathematical induction
121880
How to show that $|D_{2n}| = 2n$ via the presentation?
53327
$C_2 \times C_2$ and $C_4$