Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §3.1 Linear Approximation, #22 · Calculus · Applications of derivatives

Write down the differentials … for … and … and

Write down the differentials $df$ for $f (x) = cos x$ and $(x + 1) / (x - 1)$ and $(x^{2} + 1)^{2}$ .

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §3.1 Linear Approximation, #22

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