Proofs Without Words: Sine and Cosine of Half-Angles

SSRN Electronic Journal 2026 Preprint Open access

Read full text
Authors: Saeed Salehi
DOI: 10.2139/ssrn.6101326
Cited by: 1

Abstract

A proof without words is given for the sine and cosine of half-angles in terms of the cosine by using Pythagoras's theorem.

Fields of Study & Subjects

Mathematics and Applications History and Theory of Mathematics Advanced Mathematical Theories

Publication details

Journal / source
SSRN Electronic Journal
Publisher
Elsevier BV
Publication date
1 January 2026
Document type
Preprint