Question: linearsol(ode1, y(x)) return {}

ode1 := Diff(y(x),x$2) + (lambda-x^2)*y(x) = 0;

After put y = exp(-x^2/2)*y1(x) into above ode1

would like to find the solution of ode in terms of integration

in this example, it use z^(-lambda/2-1/2) = expa(-lambda/2-1/2)*log(z)

the example solution should be int(exp(...),z)

linearsol(ode1, y(x)); but return {}  nothing

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