lim x->0+ x/(1-cosx)^1/2 答案为什么是2
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lim x->0+ x/(1-cosx)^1/2 答案为什么是2
lim x->0+ x/(1-cosx)^1/2 答案为什么是2
lim x->0+ x/(1-cosx)^1/2 答案为什么是2
x趋于0的时候,
1-cosx等价于0.5x^2
所以
(1-cosx)^1/2等价于x /√2
因此极限值为
x/(x/√2)=√2
答案是2那肯定不对
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