Question: Please help me dear tutors with the HW below. Please give me steps and explanation so I can understand it. Thanks a million! Thinking of

Please help me dear tutors with the HW below. Please give me steps and explanation so I can understand it. Thanks a million!

Please help me dear tutors with the HW below.
Thinking of each differential equation as describing the position of a springmass system X(t]1 which of the following displays {true} resonance? And why? {i} x" + 3x = cesst [ii] 1" + 9x' +x = cos3t [iii] 3:" + 3x = 0 [iv] 3:" + 9x = ces3t

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