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Large half angles are of the form 360 × 2 n − θ {\displaystyle 360 \times 2^n - \theta} , with θ ∈ [ 0 , 90 ] {\displaystyle \theta \in [0,90]} and n ∈ { 0 , . . . , 14 } {\displaystyle n \in \{0, ... ,14\}} . They are all increasing until n ≥ 8 {\displaystyle n \geq 8} , at which point they may either be increasing or decreasing.