Помогите разобраться:
sin^2 П/8 * cos^2 П/8 = 2(sin П/8 * cos П/8)^2/2 = (2*sin П/8* cos П/8)^2/4 = (sin 2* П/8)^2/4=...

Почему число 2 в знаменателе стало 4?
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