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lesenok277
25.05.2021 22:02

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Если s(y)=y/−5+2,2,

то s(−4) =

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Ответ:
tahliaderma
26.01.2023 20:42
11sin^2 a + 9cos^2 a + 8sin^4 a + 2cos^4 a =
= 9sin^2 a + 9cos^2 a + 2sin^2 a + 6sin^4 a + 2(sin^4 a + 2cos^4 a) = (*)
Заметим, что
1) 9sin^2 a + 9cos^2 a = 9(sin^2 a + cos^2 a) = 9
2) sin^4 a + cos^4 a = sin^4 a + 2sin^2 a*cos^2 a + cos^4 a - 2sin^2 a*cos^2 a = 
= (sin^2 a + cos^2 a)^2 - 2sin^2 a*cos^2 a = 1 - 1/2*(4sin^2 a*cos^2 a)
Подставляем
(*) = 9 + 2sin^2 a + 6sin^4 a + 2 - 4sin^2 a*cos^2 a =
= 11 + 4sin^2 a - 2sin^2 a + 6sin^4 a  - 4sin^2 a*cos^2 a =
= 11 - 2sin^2 a + 6sin^4 a + 4sin^2 a*(1 - cos^2 a) =
= 11 - 2sin^2 a + 6sin^4 a + 4sin^4 a = 11 - 2sin^2 a + 10sin^4 a =
= 10(sin^4 a - 2*1/10*sin^2 a + 1/100) - 1/10 + 11 =
= 10(sin^2 a - 1/10)^2 + 109/10
Минимальное значение квадрата равно 0, а всего выражения 109/10.
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23LOLKEK
16.06.2022 01:58

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