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

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Find the linear approximation $Y$ to $y = f (x)$ near $x = a$ :

$f (x) = tan x$ , $a = π /4$

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

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