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If x = ( 3t)/( 1 + t ^(3)) and y = ( 3 t...

If `x = ( 3t)/( 1 + t ^(3)) and y = ( 3 t ^(2))/( 1 +t ^(3)),` then `(dy)/(dx) at t =1` equals

A

`-6`

B

`-1`

C

1

D

6

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