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vsesokol
@vsesokol
July 2021
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докажите тождество: 1) 3 cos 2 α – sin2 α +cos2 α = 2 cos 2 α 2) (Sin 5 α – sin 3 α)/(2 cos 4 α) = sin α упростить выражение: 1) Sin (α-β) – sin( π/2 – α) * sin (-β) 2) Cos2( π – α) – cos2 ( π/2 – α) 3) 2 sin α sin β + cos (α+β)
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