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Which describes the concavity of the function f(x) = (x² - 1) / eˣ, -2.5? A. Concave upward in (-2.5, 1) and concave downward in (1, 2.5) B. Concave downward in (-2.5, 1) and concave upward in (1, 2.5) C. Concave upward in (-2.5, 0.27) and concave downward in (0.27, 2.5) D. Concave downward in (-2.5, 0.27) and concave upward in (0.27, 2.5)
Sagot :
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