3. Solve the differential equation (a) r" - 91 = 5e²t (d) I" - I' = 8e²t (g) I" - I' = 6 sint (b) r" - 9x = 9t² (e) r" - r' = 8et (h) r" + 9x = 6e³t (c) I" — 91 = 12e 3t (f) I" - I' = 9 - 4t (1) " + 9x = 6 cos 3t

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