lim ln(cos5x)/ln(cos2x) 其中x趋向于0.求这个函数的极限~lim x→0 5sin5x /(2sin2x)=lim x→0 25x/4x=25/4.为什么这么直接?怎么一下子就到25x/4x了?
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![lim ln(cos5x)/ln(cos2x) 其中x趋向于0.求这个函数的极限~lim x→0 5sin5x /(2sin2x)=lim x→0 25x/4x=25/4.为什么这么直接?怎么一下子就到25x/4x了?](/uploads/image/z/5351021-53-1.jpg?t=lim+ln%EF%BC%88cos5x%29%2Fln%28cos2x%29+%E5%85%B6%E4%B8%ADx%E8%B6%8B%E5%90%91%E4%BA%8E0.%E6%B1%82%E8%BF%99%E4%B8%AA%E5%87%BD%E6%95%B0%E7%9A%84%E6%9E%81%E9%99%90%7Elim+x%E2%86%920+5sin5x+%2F%EF%BC%882sin2x%EF%BC%89%3Dlim+x%E2%86%920+25x%2F4x%3D25%2F4.%E4%B8%BA%E4%BB%80%E4%B9%88%E8%BF%99%E4%B9%88%E7%9B%B4%E6%8E%A5%3F%E6%80%8E%E4%B9%88%E4%B8%80%E4%B8%8B%E5%AD%90%E5%B0%B1%E5%88%B025x%2F4x%E4%BA%86%3F)
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