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Formula
Calculate the value
$$2 ^ { - 1 }$$
$\dfrac { 1 } { 2 }$
$2 ^ { \color{#FF6800}{ - } \color{#FF6800}{ 1 } }$
 If the exponent is negative, change it to a fraction 
$\dfrac { 1 } { 2 ^ { 1 } }$
$\dfrac { 1 } { 2 ^ { \color{#FF6800}{ 1 } } }$
 If the exponent is 1, get rid of it as it is unnecessary 
$\dfrac { 1 } { 2 }$