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Mathematics 23 Online
OpenStudy (anonymous):

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

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