Question: y'' + 4y = sin (t) + u pi/2 (t) cos(t) with y(0) = 0, y'(0) = 0. Find the solution of this IVP. HINT:

y'' + 4y = sin (t) + upi/2 (t) cos(t) with y(0) = 0, y'(0) = 0. Find the solution of this IVP. HINT: cos (t) is a shift of sin(t).

Please explain in detail of unit step function part.

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