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MHS에서 a(t) 와 x(t) 가 180° 위상차가 있음을 보이세요 — 즉, a = -omega^2 x
MHS에서 a(t) 와 x(t) 가 180° 위상차가 있음을 보이세요 — 즉, a = -omega^2 x
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