[積分] 兩題方程式
第一題
Slove the non-linear 2nd oderder D.E.
yy"=y'3
第二題
If y1=x is a relation to the D.E.
(1+x)y"+xy'-y=0
use the method of reduction of order ，
to find y2(x) and W(x) ，
then slove that y1 and y2 are linerly independent 。
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