Answer
$\lim\limits_{h\to0}\dfrac{(1-\cos{h})^2}{h}=0.$
Work Step by Step
$\lim\limits_{h\to0}\dfrac{(1-\cos{h})^2}{h}=\lim\limits_{h\to0}\dfrac{1-\cos{h}}{h}\times\lim\limits_{h\to0}(1-\cos{h})=1(1-\cos{0})$
$=(0)(0)=0.$
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