Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §2.4 The Derivative of the Sine and Cosine, #12 · Calculus · Differentiation rules

Compute the slope at … directly from limits: (a) … (b)

Compute the slope at $x = 0$ directly from limits:
(a) $y = tan x$ (b) $y = sin (- x)$

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §2.4 The Derivative of the Sine and Cosine, #12

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