Nelsen, Roger B. Golden tiles and arctangent identities. (English) Zbl 1505.97020 Math. Mag. 95, No. 5, 569-570 (2022). MSC: 97G40 51M04 52C20 PDFBibTeX XMLCite \textit{R. B. Nelsen}, Math. Mag. 95, No. 5, 569--570 (2022; Zbl 1505.97020) Full Text: DOI
Wu, Rex H. Proof without words: some arctangent identities involving 2, the golden ratio, and their reciprocals. (English) Zbl 1434.51013 Math. Mag. 92, No. 2, 108-109 (2019). MSC: 51M04 PDFBibTeX XMLCite \textit{R. H. Wu}, Math. Mag. 92, No. 2, 108--109 (2019; Zbl 1434.51013) Full Text: DOI