The curve y = 1/(x 2 + 1) is called the witch of Agnesi (Figure 6) after
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The curve y = 1/(x2 + 1) is called the witch of Agnesi (Figure 6) after the Italian mathematician Maria Agnesi (1718– 1799). This strange name is the result of a mistranslation of the Italian word la versiera, meaning “that which turns.” Find equations of the tangent lines at x = ±1.
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-3 -2 -1 y 1 + 2 3 X
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