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[" 63.In a "Delta PQR," IR "=(pi)/(2)" i...

[" 63.In a "Delta PQR," IR "=(pi)/(2)" if "tan((P)/(2))" and "tan((Q)/(2))" are the roots of the equation "ax^(2)+bx+c=0(a!=0)],[" then "],[[" 1) "a+b=c," 2) "b+c=a," 3) "a+c=b," 4) "b=c]]

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