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Нафаня88
@Нафаня88
July 2022
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4cos²π\8 - 4cos^4 π\8 - 4=...
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sedinalana
Verified answer
4*(1+сosπ/4)/2-4*(1+cosπ/4)²/4-4=2*(1+√2/2)-(1+√2/2)²-4=
=2+√2-1-√2-1/2-4=-3,5
2 votes
Thanks 1
gyraffff
У меня получилось вот так. Можешь попробовать по формулам
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4*(1+сosπ/4)/2-4*(1+cosπ/4)²/4-4=2*(1+√2/2)-(1+√2/2)²-4==2+√2-1-√2-1/2-4=-3,5