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A: In a Delta ABC, Delta =a^2-(b-c)^2 then tan""A/2=1/2 R: In a Delta ABC, tan""A/2= Delta/((s-b)(s-c))

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A is TRUE, R is true and R is CORRECT explanation of A
A is true, R is true and R is not correct explanation of A
A is true, R is false
A is false, R is true

Answer :D


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