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[" (b) "[" ufz "tan A*tan B=sqrt((a-b)/(...

[" (b) "[" ufz "tan A*tan B=sqrt((a-b)/(a+b))" is "A/" furs anf "AO" fis "],[a-b cos2A)(a-b cos2B)=a^(2)-b^(2)],[a-b]]

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