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[" 13.Given ":(b+c)/(11)=(c+a)/(12)=(a+b...

[" 13.Given ":(b+c)/(11)=(c+a)/(12)=(a+b)/(13)" for a "Delta ABC" with usual notation."],[" If "(cos A)/(alpha)=(cos B)/(beta)=(cos C)/(gamma)," then the ordered triad "(alpha,beta,gamma)" has "],[" a value "]

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