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If the measure of angle is θ is 7π /4, which statements are true?
A. sin (θ ) = - sqrt(2)/2
B. The measure of the reference angle is 60°
C. The measure of the reference angle is 30°
D. The measure of the reference angle is 45°
E. tan (θ ) =-1
F. cos (θ ) = - sqrt(2)/2

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