Question

find the solution of y'' + 9y' = 1296 sin(9t) + 1134 cos(9t) with y(0)=4 and...

find the solution of

y'' + 9y' = 1296 sin(9t) + 1134 cos(9t)

with y(0)=4 and y'(0)=7

y=?

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