3 ms·
perhaps: https://forumgeom.fau.edu/FG2009volume9/FG200925.pdf https://forumgeom.fau.edu/FG2009volume9/FG200925.pdf On the Possibility of Trigonometric Proofs o
by nolamark 4y ago
perhaps: https://forumgeom.fau.edu/FG2009volume9/FG200925.pdf https://forumgeom.fau.edu/FG2009volume9/FG200925.pdf
On the Possibility of Trigonometric Proofs of the
Pythagorean Theorem
Jason Zimba
Abstract. The identity cos2 x + sin2 x = 1 can be derived independently of the
Pythagorean theorem, despite common beliefs to the contrary.