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Find the impulse response functions ?(?) or ?(Ω) for the following differential and difference equations, and...

Find the impulse response functions ?(?) or ?(Ω) for the following differential and difference equations, and plot the magnitude.

a. 2?̈(?) + 6?̇(?) + ?(?) = ?̇(?) + 6?(?)

b. ?[? + 1] + 0.4?[?] = 9?[? + 1]

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