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Question

If 3x2+4xy+2y2+x8=0 then the value of dydx at (1,3) is


A

-7/8

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B

7/8

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C

-8/7

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D

8/7

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Solution

The correct option is A

-7/8


3x2+4xy+2y2+x8=06x+4(y+xy1)+4y.y1+1=0y1=(6x+4y+1)4(x+y)


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