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" (ii) "(sin(5 pi)/(12)-sin(pi)/(12))/(c...

" (ii) "(sin(5 pi)/(12)-sin(pi)/(12))/(cos(5 pi)/(12)+cos(pi)/(12))=(1)/(sqrt(3))" ."

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cos(pi/12)+sin^2((3pi)/12)+sin^2((9pi)/12)+cos((11pi)/12)=...