An understanding of the three trigonometric ratios and how to change the subject of a formula is essential. The Greek letter, Ɵ (theta) is often used as a symbol for an unknown angle. For a right ...

Mathematicians had long thought that using trigonometry to prove the theorem was unworkable, given that the fundamental ...

They used the Law of Sines in their proof, avoiding circular reasoning, which has long been considered unworkable due to the ...