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Question

If (a+bx)ey/x=x, then prove that x3d2ydx2=(xdydxy)2

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Solution

(a+bx)ey/x=xey/x=xa+bxtakingloglogey/x=log(xa+bx)yx=logxlog(a+bx)y=x[logxxlog(a+bx)]y=x.1x+logx.1x(1a+bx)×blog(a+bx)(i)y′′1xb{(a+bx)×1x(b)(a+bx)21a+bx×b}x3y′′=(xdydx)22xydydx+y2=(xdydxy)2
Proved.

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