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The minimum value of px+qy when xy= r^2 ...

The minimum value of px+qy when xy= `r^2` is

A

`2 r sqrt(pq)`

B

`2pq sqrt( r )`

C

`-2r sqrt(pq)`

D

none

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The correct Answer is:
A
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DIPTI PUBLICATION ( AP EAMET)-APPLICATIONS OF DIFFERENTIATION-EXERCISE 1E (MAXIMA AND MINIMA)
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