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lim(t→0)t/√(1-cost)=lim(t→0)1/{[1/2]×(1-cost)^(-1/2)×sint}=lim(t→0)[2(1-cost)^1/2]/sint=lim(t→0)[(1-cost)^(-1/2)]/cost=lim(t→0)1/[cost(1-cost)^(1/2)].當t→0的時候,1-cost→0,所以說極限不存在....
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