Let over all real numbers.
Which of the numerical answers listed is NOT a possible value of ?
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The function has a minimum value of 0.5 at x = 0 and asymptotically approaches 1 from below as x approaches positive and negative infinity. So 0.5, 0.6, 0.7, 0.8, and 0.9 are all possible values, but 0.4 is not.