In `DeltaABC if 2s =a +b+c and (s-b)(s-c)=x' sin'^(2)(A)/(2)` ,then the value of x is

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In `DeltaABC if 2s =a +b+c and (s-b)(s-c)=x" sin"^(2)(A)/(2)` ,then the value of x is
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