Which of the following forced 2nd order equations has solutions clearly exhibiting beats? Ⓒ+2y=10 cos(t) Ⓒy+ly=2cos (21) +9y=1 cos(3) All of the above None of the above Recall that a forced, undamped, 2nd order linear differential equation y" + ay = cos(at) has solutions displaying beats when √a-w

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