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[" 1.The function "],[f:R rarr[-(1)/(2),...

[" 1.The function "],[f:R rarr[-(1)/(2),(1)/(2)]" defined as "f(x)=(x)/(1+x^(2))," is "],[" 1) injective but not surjective."],[" 2) surjective but not injective."],[" 3) neither injective nor surjective."4" ) invertible "]

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