упростите выражение (cos2альфа -sin^2 альфа)/(2sin^2альфа - cos^2альфа)
(cos2α -sin² α)/(2sin²α - cos²α)=(cos²α-sin² α-sin² α)/(2sin²α - cos²α)== - (cos²α-2sin² α)/(cos²α-2sin² α)= -1
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(cos2α -sin² α)/(2sin²α - cos²α)=(cos²α-sin² α-sin² α)/(2sin²α - cos²α)=
= - (cos²α-2sin² α)/(cos²α-2sin² α)= -1