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x(t) = Acos(omega t + phi) 가 미분방정식 \ddotx + omega^2 x = 0 을 만족함을 검증하세요
x(t) = Acos(omega t + phi) 가 미분방정식 \ddotx + omega^2 x = 0 을 만족함을 검증하세요
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