olymmath

SE-SKOLORNAS 1977 Problem 4

    Show that if cos⁡xcos⁡y+sin⁡xsin⁡y=−1\frac{\cos x}{\cos y}+\frac{\sin x}{\sin y}=-1 then cos⁡3ycos⁡x+sin⁡3ysin⁡x=1\frac{\cos^3 y}{\cos x}+\frac{\sin^3 y}{\sin x}=1

    Dataset text AI-MO AoPS. 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.

    Add a solution

    Similar problems

    These problems have the most words in common with this statement.

    Locator se-skolornas/1977/p4 · Tag G15QAWK95K · Edit this page on GitHub · Keys: j next, k previous