Answer
$\left( 12\dfrac {1}{2}\right) ^{0}$
Work Step by Step
Becouse one minute is one sixtyth of one degree
$12^{0}30'=12^{0}+\left( \dfrac {1}{60}\times 30\right) ^{0}=12^{0}+\dfrac {1^{0}}{2}=\left( 12\dfrac {1}{2}\right) ^{0}$
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