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If $f\left( x \right) ={ x }^{ \frac { 2 }{ 3 } }$ , then $f^{ \prime }\left( x \right) =$

A

$\cfrac { 1 }{ 3{ x }^{ \frac { 1 }{ 3 } } } $

B

$\cfrac { 3 }{ 2{ x }^{ \frac { 1 }{ 3 } } } $

C

$\cfrac { 2 }{ 3{ x }^{ \frac { 1 }{ 3 } } } $

D

$\cfrac { 2 }{ 3 } { x }^{ \frac { 1 }{ 3 } }$

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