For a differential equation x^2 y" -3xy' +4y = 0,
(a)use z = lnx to transform such an equation into an equation with constant
coefficients
(b)find the general solution of (a) in terms of x.
這題爬文後，還是不懂...
感覺目的好像是利用 z=lnx 把y'和y"換掉而以...
可以麻煩詳細說明嗎?! @@"
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