1.

( b^(2) -c^(2))/( a^(2)) =

Answer»

` ( SIN (B-C))/( sin (B+ C) ) `
` ( COS(B-C))/( cos(B+ C) ) `
` (sin(B+C))/( sin(B- C) ) `
` (cos(B+C))/( cos(B- C) ) `

ANSWER :A


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