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Q.

The shortest distance of (0, 0) from the curve y =

ex+ex2 is 

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a

2

b

1/3

c

1/2 

d

none of these

answer is D.

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Detailed Solution

Let (x,y) be any point on y=ex+ex2

U=S2= square of distance of  (x,y) from   (0,0)

              =x2+e2x+e2x4+12

dUdx=2x+e2xe2x2=0 for x=0

and d2Udx2>0 at  x=0 Hence  S2 is min for x=0

and min S2=12+12=1.

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The shortest distance of (0, 0) from the curve y =ex+e−x2 is