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Find the solution of the initial value problem y′′+4y=t2+7et y(0)=0, y′(0)=2. Enter an exact answer. Enclose...

Find the solution of the initial value problem y′′+4y=t2+7et y(0)=0, y′(0)=2.

Enter an exact answer.

Enclose arguments of functions in parentheses. For example, sin(2x).

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