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Which of the following set of positive and negative angles is coterminal with 270°?a) 630° and -90°b) 450° and -90°c) 90° and -90°d) 630° and -450°

Which of the following set of positive and negative angles is coterminal with 270°?

a) 630° and -90°
b) 450° and -90°
c) 90° and -90°
d) 630° and -450°