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## Main Question or Discussion Point

Is there any general method to solve the following linear equation:

[ D^6+a D^4+b D^2+(c-d sech^2(x))] y=0?

Here, D=d/dx and a,b,c,d are constants.

[ D^6+a D^4+b D^2+(c-d sech^2(x))] y=0?

Here, D=d/dx and a,b,c,d are constants.