Найдем первую производную
ω(t) = φ'(t) = 12 * t + 7
ω(2) = 12 * 2 + 7 = 31 рад/с
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Найдем первую производную
ω(t) = φ'(t) = 12 * t + 7
ω(2) = 12 * 2 + 7 = 31 рад/с