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Determine if pure resonance occur in the following undamped mass-spring system my''+ ky = f(t) where...

Determine if pure resonance occur in the following undamped mass-spring system
my''+ ky = f(t)
where m = 1kg, k = 9N/m and the driving force f(t) is given by the 2π-periodic function
f(t) = ( −1, 0 < t < π
1, π < t < 2π

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