Word Count : 185

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We need to find the derivative of: \[ f(x) = \ln(1 + x^2) \] with respect to \( x^{-1} \) (which means we differentiate with respect to \( \frac{1}{x} \)). ### Step 1: Chain Rule Application Let \( u = \frac{1}{x} \), so we need to ________ _________ _________ ___ ______ _____ ____ _______ _____ ___.
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