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OpenStudy (anonymous):
if cos x cos(pi/7)+sin x sin(pi/7)=-sqrt 2/2, then x can equal:__. a.(pi/4)+(pi/7)+2npi b.(5pi/4)+(pi/7)+2npi c.(7pi/4)+(pi/7)+2npi d.(3pi/4)+(pi/7)+2npi
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OpenStudy (anonymous):
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