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Let fnx be the nth derivative of fx. The least value of n so that fn=fn+1 where fx=x2+ex is 

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Important Questions on Applications of Derivatives

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If from a wire of length 36 metre a rectangle of greatest area is made, then its two adjacent sides in metre are
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Twenty meters of wire is available for fencing off a flower-bed in the form of a circular sector. Then the maximum area (in sq.m) of the flower-bed, is 
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The sum of two non-zero numbers is 4. The minimum value of the sum of their reciprocals is
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The area of a rectangle will be maximum for the given perimeter, when rectangle is a
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A population pt of 1000 bacteria introduced into nutrient medium grows according to the relation pt=1000+1000t100+t2. The maximum size of this bacterial population is
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The value of a, so that the sum of the squares of the roots of the equation x2-(a-2)x-a+1=0, assume the least value, is