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Find the steady periodic solution to the differential equation ?″+3?′+49?=4sin(2?) in the form ???(?)=?cos(??−?), with C...

Find the steady periodic solution to the differential equation ?″+3?′+49?=4sin(2?) in the form ???(?)=?cos(??−?), with C > 0 and 0≤ ? <2?

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