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OpenStudy (anonymous):
if cos x cos (pi/7) + sin x sin (pi/y)=-sqrt2/2, then x can equal: Check all that apply a. pi/4+pi/y+2npi b. 5pi/4+pi/7+2npi c. 7pi/4+pi/7+2npi 3pi/4+pi/7+2npi
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