## The Trigonometric Ratio Hexagon

I found a book this morning containing a hexagonal figure of trigonometric ratios. It reminded me of the mnemonics I created when I was still in high school in order to remember the formulas during exams. Unlike in other countries, we were not allowed to have formula sheets during exams, so we have to memorize them all.

In the figure, any trigonometric ratio is a product of its immediate neighbors. Therefore, » Read more