1.

IfDelta ABCis such thatangle A = 90 ^(@) , angle B ne angle C " then " ( b^(2) + c^(2))/( b^(2) - c^(2)) sin ( B- C)=

Answer»

`(1)/(3) `
` (1)/(2)`
`1`
` ( 3)/(2)`

ANSWER :C


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