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MIT 18.03SC Differential Equations
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OpenStudy (anonymous):
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OpenStudy (anonymous):
OpenStudy (athe):
Try to introduce new variables :\[x_1+x_2=y_1,\\ x_1-x_2=y_2\] And after that: \[{y_1}^{''}+4y_1=7\cos{3t} \\ {y_2}^{''}+16y_2=7\cos{3t}\]
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