\[ a e^{b x} y(x)+y''(x)=0 \] ✓ Mathematica : cpu = 0.0129624 (sec), leaf count = 55
DSolve[a*E^(b*x)*y[x] + Derivative[2][y][x] == 0,y[x],x]
\[\left \{\left \{y(x)\to c_1 \operatorname {BesselJ}\left (0,\frac {2 \sqrt {a} \sqrt {e^{b x}}}{b}\right )+2 c_2 \operatorname {BesselY}\left (0,\frac {2 \sqrt {a} \sqrt {e^{b x}}}{b}\right )\right \}\right \}\] ✓ Maple : cpu = 0.105 (sec), leaf count = 39
dsolve(diff(diff(y(x),x),x)+a*exp(b*x)*y(x)=0,y(x))
\[y \left (x \right ) = c_{1} \operatorname {BesselJ}\left (0, \frac {2 \sqrt {a}\, {\mathrm e}^{\frac {b x}{2}}}{b}\right )+c_{2} \operatorname {BesselY}\left (0, \frac {2 \sqrt {a}\, {\mathrm e}^{\frac {b x}{2}}}{b}\right )\]