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Formula
Calculate the value
$$4 ^ { - 2 }$$
$\dfrac { 1 } { 16 }$
$4 ^ { \color{#FF6800}{ - } \color{#FF6800}{ 2 } }$
 If the exponent is negative, change it to a fraction 
$\dfrac { 1 } { 4 ^ { 2 } }$
$\dfrac { 1 } { \color{#FF6800}{ 4 } ^ { \color{#FF6800}{ 2 } } }$
 Calculate power 
$\dfrac { 1 } { \color{#FF6800}{ 16 } }$