Question: ???????I need solution steps for this differential equation 8. Find the general solution of the differential equation ( y^{prime prime}+9 y=9 sec ^{2}(3 x) ).

???????I need solution steps for this differential equation 8. Find the general solution of the differential equation $ y^{\prime \prime}+9 y=9 \sec ^{2}(3 x) $. \[ \text { Answer: } y=c_{1} \cos (3 x)+c_{2} \sin (3 x)+\sin (3 x) \ln |\sec (3 x)+\tan (3 x)|- 2 answers

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