1.

(cos ^(2)((B-C)/( 2)) )/( (b+c)^(2))+( sin ^(2)((B-C)/( 2)) )/( (b-c)^(2))=

Answer»

` (1)/(a^(2))`
` ( 2)/( a^(2))`
`( a^(2))/( 2) `
` a^(2) `

ANSWER :A


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