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= 4 . sin 22,5° . cos 22,5°
= 4 . sin 225°/10 . cos 225°/10
= 4 . -1/2√2 / 10 . -1/2√2 / 10
= 4 . 1/2 / 100
= 4 . 1/200
= 1/50
= 0,02