\frac { d ^ { 2 } p } { d x ^ { 2 } } + 2 \frac { d p } { d x } + 9 p = 0
Solve for x (complex solution)
x\in \mathrm{C}
p=0
Solve for p
p=0
Solve for x
x\in \mathrm{R}
p=0
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\frac { d ^ { 2 } p } { d x ^ { 2 } } + 2 \frac { d p } { d x } + 9 p = 0
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