4 Which of the following second order, lincar IVPs are guaran- teed a unique solution by our existence/uniqueness theorem? Explain. (a) t²y" + y + Aty = sin(t) with y(0) = 1 and y'(0) = 1 (b) sin(t)y"+y' + c'y=1 with y(1) = 1 and y'(1) = 1 (c) y" + cos(t) + 4t²y = with y(0) = 1 and y'(0) = 1

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