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[(A+B)=1sin(A-B)=1," and "B=AA" Arents "...

[(A+B)=1sin(A-B)=1," and "B=AA" Arents "],[[(A-B)=cos(A+B)=(1)/(2),," in "A" and "B=1/9 pi],[-B=,(1)/(-C)cos(A+B)=(1)/(2);0^(@)B]]

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