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OpenStudy (anonymous):
if sin x co(pi/7)-sin(pi/7)cos x= -sqrt2/2 then x can equal ____ check all that apply. a- 3pi/4+pi/7+2npi b- 5pi/4+pi/7+2npi c- pi/4+pi/7+2npi d- 7pi/4+pi/7+2npi
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OpenStudy (anonymous):
thats cos not co. typo.
OpenStudy (anonymous):
your this expression becomes Sin(x-pi/7)= -sqrt 1 Sin(x-pi/7)=-1 Sin(x-pi/7)= -sin(pi/2) Sin(x-pi/7)=sin(3pi/4) x= 3pi/4 + pi/7+ 2n pi that is a your answer is a
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