Find the Reference Angle minus four hundred twenty degrees

Find the Reference Angle -420 degrees
Find an angle that is positive, less than , and coterminal with .
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Add to .
The resulting angle of is coterminal with but isn't positive. Repeat the step.
Add to .
The resulting angle of is positive and coterminal with .
Since the angle is in the fourth quadrant, subtract from .
Subtract from .
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