[" (A) "(0,1)quad " (B) "((pi)/(2),pi)qu...

[" (A) "(0,1)quad " (B) "((pi)/(2),pi)quad " (C) "(0,(pi)/(2))quad " (D) None of these "],[" Find the least value of "a" such that the function "f" given by "f(x)=x^(2)+ax+],[" strictly increasing on "(1,2)" ."]

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