Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §2.4 The Derivative of the Sine and Cosine, #1 · Calculus · Differentiation rules

Which of these ratios approach 1 as

Which of these ratios approach 1 as $h \to 0$ ?
(a) $\frac{h}{s i n h}$ (b) $\frac{s i n ^{2} h}{h ^{2}}$ (c) $\frac{s i n h}{s i n 2 h}$ (d) $\frac{s i n ( - h )}{h}$

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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, #1

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