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OpenStudy (anonymous):
Can i ask for some help please 2cos(2x+pi/2)= -sqrt2 where x is an element [-pi,pi] not quite sure what to do with the bracket part
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Miracrown (miracrown):
That's the domain, that's just the allowed values of x they only want x's between -pi and pi, not anything outside of that range
Miracrown (miracrown):
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