Правильно: 𝝅/2, -𝝅/2, -𝝅/3, 𝝅/3, 𝝅/4, -𝝅/4, -𝝅/6, 𝝅/6, 𝝅, -𝝅, 2𝝅, -2𝝅, 3𝝅/2, -3𝝅/2, 3𝝅/4, -3𝝅/4, 5𝝅/6, -5𝝅/6, 2𝝅/3, -2𝝅/3, -2𝝅/4, 3𝝅/9, Неправильно: 3𝝅/7, -3𝝅/7, 3𝝅/5, -3𝝅/5, 5𝝅/8, -5𝝅/8, 9𝝅/11, -9𝝅/11, 4𝝅/9, -4𝝅/9, 3𝝅/11, -3𝝅/11, 7𝝅/13, -7𝝅/13, 6𝝅/19, -6𝝅/19, 4𝝅/11, -4𝝅/11, 5𝝅/13, -5𝝅/13,

А-10. Тригонометрия - 1

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