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Unit Circle: Reference Angle in Radian Measure

TRIG-4YGEXI

Find the exact value of the reference angle, in radian measure, of the given angle $\cfrac { 7\pi }{ 12 }$.

A

$\cfrac { 5\pi }{ 12 }$

B

$\cfrac { 17\pi }{ 12 }$

C

$\cfrac { 19\pi }{ 12 }$