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Q.

if,y=xlog⁡xa+bx then x3d2ydx2=

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a

xdydx−y

b

xdydx−y2

c

ydydx−x

d

ydydx−x2

answer is B.

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Detailed Solution

yx=log⁡x−log⁡(a+bx)xdydx−yx2=1x−ba+bx=ax(a+bx)∴xdydx−y=axa+bx……...(1)Diff again w..r.t ‘x’ we getxd2ydx2+dydx−dydx=(a+bx)a−ax⋅b(a+bx)2xd2ydx2=a2(a+bx)2x3d2ydx2=a2x2(a+bx)2=xdydx−y2by eq(1)
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