Theorem Real.quadratic_root_cos_pi_div_five

Modification history

2024-10-04 08:21
Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean
feat: the cosine of `π / 5` is `(1 + √5) / 4` (#17393)
Added Real.quadratic_root_cos_pi_div_fiveView on Github →