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cos x функция периодическая с периодом 2π или 180°, поэтому из 990° смело исключаем 4 целых периода, т.е. 720°.990-720=270находим значение cos 270°cos 270°= cos 3π/2 = 0
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Автор:
jaquelinecajr - 5 лет назад
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(27x^5+24x^3)/(12x^3 )÷3x/2= как решить эту дробь?
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