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20.12.2020 04:01

Представьте выражение в виде многочлена (5a1 — 2a7)

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07Лизочек07
04.07.2022 06:50

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Must Waste More Time...

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Ответ:
honeydrink34324
25.03.2022 03:44
Простое тригонометрическое уравнение. Косинус равен минус 1/2, когда его аргумент равен (120° или 2π/3) и (240° или 4π/3). Ещё следует добавить период 2πn, где n ∈ Z (целое).

Т.е. решением cos(x-π/4) = -1/2 будет:
1) x - π/4 = 2π/3 + 2πn;  x = 2π/3 + π/4 + 2πn = 11π/12 + 2πn
2) x - π/4 = 4π/3 + 2πn;  x = 4π/3 + π/4 + 2πn = 19π/12 + 2πn

Если последнее чем-то не нравится, то можно из решения вычесть один период, т.е. 2π = 24π/12. Тогда, второе решение буде выглядеть так: x = 19π/12 + 2πn - 24π/12 = -5π/12 + 2πn. Но это одно и тоже.
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