For the differential equation

$(x^2+4)y^{\text{'}\text{'}}+2x{y}^{\text{'}}-12y=0,$

the singular points are $q,$

$x=+-\sqrt[\phantom{2}]{2}$

b$)$ None

c$)*$

$x=+-2i$

$x=+-2$

e$)x=0,2$

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