The Involute of a Circle, and the Three Machines Made of It — manic

Turn This Point 60 Degrees — An Olympiad Complex Numbers Problem — manic

18 Roots Times 48 Roots — An Olympiad Complex Numbers Problem — manic

How Close Do These Two Curves Get? — An Olympiad Geometry Problem — manic

Unwind a String: Four Curves, and Four Involutes Each — manic

Minimise an Integral You Cannot Avoid Splitting — A JEE Calculus Problem — manic

Two Parallel Lines in Space — An Olympiad Vectors Problem — manic

Two Diagonals at Random — An Olympiad Probability Problem — manic