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    y" - 6 y - 7 = 3sin(2x) +15 cos(2x)
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    (Original post by Bengmech)
    y" - 6 y - 7 = 3sin(2x) +15 cos(2x)
    Post your workings/attempt in the maths forum
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    (Original post by M14B)
    Post your workings/attempt in the maths forum
    Alright !
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    Particular integral should be of form  a\cos 2x +b\sin 2x .
 
 
 
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