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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §2.1 The Derivative of a Function, #11 · Calculus · Derivatives

When …, simplify the difference …, divide by …, and set

When $f (t) = 4/ t$ , simplify the difference $f (t + Δ t) - f (t)$ , divide by $Δ t$ , and set $Δ t = 0$ . The result is $f^{'} (t)$ .

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §2.1 The Derivative of a Function, #11

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