KöMaL 2013 B4549
Prove that the sum of the sines of the angles in a triangle cannot be smaller than the sum of the sines of the doubles of the angles.
Official text KöMaL. Quoted with source.
Solutions
No solution is on olymmath yet. Official and human solutions come first when they arrive. AI solutions come after them, with a label.
Similar problems
These problems have the most words in common with this statement.