ABSTRACT
We rewrite the expression as https://www.w3.org/1998/Math/MathML"> ( tan 45 ∘ + tan 15 ∘ 1 − tan 45 ∘ tan 15 ∘ ) 2 = E , https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781003341468/d4c0c4c8-8291-444b-87ca-3efd613fe6ea/content/math4_1.tif" xmlns:xlink="https://www.w3.org/1999/xlink"/>
