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\frac{d^{2} x}{d y^{2}} + w^{2} x = 0

\frac{d^{2} x}{d y^{2}} + w^{2} y = 0

\frac{d^{2} x}{d t^{2}} + w^{2} t = 0

\frac{d^{2} x}{d t^{2}} + ϖ^{2} x = 0

ANS : 4

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