lim(1-cost)=t^2/2求解答,

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lim(1-cost)=t^2/2求解答,
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lim(1-cost)=t^2/2求解答,
lim(1-cost)=t^2/2求解答,

lim(1-cost)=t^2/2求解答,
因为1-cost=2sin^2 t/2
当t-->0时,因为sint-->t,
故sin^2 t/2-->(t/2)^2=t^2/4.
所以lim(1-cost)=lim2sin^2 t/2=lim2 *t^2/4=t^2/2

这个是等价无穷小代换