A procedure due to L. D. Servi for evaluating sines and cosines of certain angles in terms of nested square roots of 2 is discussed. It is shown how it can be applied using the binary digits of the ...

Revise how to use the sine and cosine rules to find missing angles and sides of triangles as part of National 5 Maths.

Their approach? A trigonometric proof that bypasses the traditional foundations of sine and cosine, removing any dependency on Pythagoras’ theorem itself.