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OpenStudy (anonymous):
If sinx cos(Pi/7) - sin (Pi/7) cos x = - (sqrt(2) )/ 2 , then x can equal which of the following answerS <--notice S .... A. (5Pi)/4 + PI/7 + 2nPI B. 7PI/ 4 + PI/7 + 2nPI C. Pi/4 + PI/7 + 2nPI D. 3PI/4 + PI/7 + 2nPI
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