` ( 2sqrt(bc))/( b-c) SIN ""(A)/(2) ` ` ( 2sqrt(bc))/( b+c) sin ""(A)/(2) ` ` ( 2sqrt(bc))/( b+c) COT""(A)/(2) ` ` ( 2sqrt(bc))/( b+c) TAN""(A)/(2) `
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