Which expression finds the measure of an angle that is coterminal with a 126 degrees angle?

Coterminal angles differ by a whole number of full rotations, and one full rotation is 360 degrees. So an angle coterminal with 126 degrees has the form 126 + 360n degrees, where n is an integer. Choice A adds 720n degrees, which is also a whole-number multiple of 360 degrees, so it always gives a coterminal angle.

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