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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §2.1 The Derivative of a Function, #12 · Calculus · Derivatives

Find the derivative of … from

Find the derivative of $1/ t^{2}$ from $Δ f (t) = 1/ (t + Δ t)^{2} - 1/ t^{2}$ . Write $Δ f$ as a fraction with the denominator $t^{2} (t + Δ t)^{2}$ . Divide the numerator by $Δ t$ to find $Δ f /Δ t$ . Set $Δ t = 0$ .

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §2.1 The Derivative of a Function, #12

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