ln(1+x+x^2)当x-0时为什么不能用等价无穷小替换ln(1+x+x^2)-ln(1-x+x^2)这是分子分母是x(1-cosx)当x-0时求它的极限?
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![ln(1+x+x^2)当x-0时为什么不能用等价无穷小替换ln(1+x+x^2)-ln(1-x+x^2)这是分子分母是x(1-cosx)当x-0时求它的极限?](/uploads/image/z/1697522-50-2.jpg?t=ln%281%2Bx%2Bx%5E2%29%E5%BD%93x-0%E6%97%B6%E4%B8%BA%E4%BB%80%E4%B9%88%E4%B8%8D%E8%83%BD%E7%94%A8%E7%AD%89%E4%BB%B7%E6%97%A0%E7%A9%B7%E5%B0%8F%E6%9B%BF%E6%8D%A2ln%281%2Bx%2Bx%5E2%29-ln%281-x%2Bx%5E2%29%E8%BF%99%E6%98%AF%E5%88%86%E5%AD%90%E5%88%86%E6%AF%8D%E6%98%AFx%281-cosx%29%E5%BD%93x-0%E6%97%B6%E6%B1%82%E5%AE%83%E7%9A%84%E6%9E%81%E9%99%90%3F)
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