12. Which of the following gives the antiderivatives of $\frac{1 - x^2}{(1 + x^2)^2}$? (a) $\frac{x}{1 + x^2} + C$ (b) $\frac{1}{1 + x^2} + C$ (c) $\frac{1 - x}{1 + x^2} + C$ (d) $\frac{1}{(1 + x^2)^2} + C$ (e) $\frac{x}{(1 + x^2)^2} + C$
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Step 1: The antiderivative of (1+2) is given by integrating the function with respect to the variable x. Show more…
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One of the two antiderivatives can be determined using basic algebra and the antiderivative formulas we have presented. Name the method by finding the antiderivative of this one and label the other "N/A." (a) $\int\left(\frac{1}{x^{2}}-1\right) d x$ (b) $\int \frac{1}{x^{2}-1} d x$
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