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Q.

If y=x22+x2x2+1+logx+x2+1  ,then xdydx+logdydx=

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a

0

b

2y

c

y

d

y2

answer is B.

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Detailed Solution

y=x22+x2x2+1+log x+x2+1 dydx=x+x12x2+1(2x)+x2+112              +12 1x+x2+1 1+12x2+1(2x)

dydx=x+x2x2+1+12x2+1+121x2+1       =x+x2+(x2+1)+12x2+1       =x+2(x2+1)2x2+1       =x+x2+1  x dydx+log dydx    =x2+x x2+1+log x+x2+1     =2y

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If y=x22+x2x2+1+logx+x2+1  ,then xdydx+logdydx=