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QueenWorlD1
@QueenWorlD1
June 2022
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решите срочно пожалуйста()()*)()())) !.
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sharadi
Verified answer
2Sin²α +Cos4α = 1
Cos4α = 1 - 2Sin²α
2Cos²2α -1 = Cos2α
2Cos²2α - Cos2α - 1 = 0
D = 1 + 8= 9
a) Cos2α = 1 б) Cos2α = -1/2
2α = 2πk , k ∈Z 2α = +-2 π/3 + 2πn , n ∈Z
α=πk , k ∈Z α = +-π/3 + πn , n ∈Z
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Answers & Comments
Verified answer
2Sin²α +Cos4α = 1Cos4α = 1 - 2Sin²α
2Cos²2α -1 = Cos2α
2Cos²2α - Cos2α - 1 = 0
D = 1 + 8= 9
a) Cos2α = 1 б) Cos2α = -1/2
2α = 2πk , k ∈Z 2α = +-2 π/3 + 2πn , n ∈Z
α=πk , k ∈Z α = +-π/3 + πn , n ∈Z