But Jackson and Johnson managed to prove the theorem using a result of trigonometry called the Law of Sines, dodging circular ...

The angles are labelled with capital letters. The opposite sides are labelled with lower case letters. Notice that an angle and its opposite side are the same letter. The sine rule is: \(\frac{a} ...

It's long been claimed impossible to use trigonometry to prove what is effectively ... able to come up with novel solutions ...