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Ifx^(2)+y^(2)=4 and a^(2)+b^(2)=9 then...

If`x^(2)+y^(2)=4 and a^(2)+b^(2)=9` then

A

maximum value of (abxy)is 9

B

maximum value of (abxy)is 36

C

maximum value of (ax+by) is 6

D

minimum value of (ax+by) is -6

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A, C, D
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