cos^2a-4sin^2(a/2)*cos^2(a/2)
a - альфа
task/5544845 cos²α - 4sin²(α/2)*cos²(α/2)
"решение" как продлить ... жизнь cos²α - 4sin²(α/2)*cos²(α/2) =
( cosα -2sin(α/2)*cos(α/2) )*( cosα + 2sin(α/2)*cos(α/2) ) =
(cosα - sinα)* (cosα + sinα) = cos²α - sin²α = cos2α .
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task/5544845 cos²α - 4sin²(α/2)*cos²(α/2)
"решение" как продлить ... жизнь cos²α - 4sin²(α/2)*cos²(α/2) =
( cosα -2sin(α/2)*cos(α/2) )*( cosα + 2sin(α/2)*cos(α/2) ) =
(cosα - sinα)* (cosα + sinα) = cos²α - sin²α = cos2α .