lim x→1 sin(x2-1)/x-1 sin为什么可以去掉lim(x->1)[sin(x^2-1)/x-1]=lim(x->1)[(x^2-1)/x-1]=lim(x->1)(x+1)=2 担不明白为什么sin怎样去掉
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![lim x→1 sin(x2-1)/x-1 sin为什么可以去掉lim(x->1)[sin(x^2-1)/x-1]=lim(x->1)[(x^2-1)/x-1]=lim(x->1)(x+1)=2 担不明白为什么sin怎样去掉](/uploads/image/z/11556508-4-8.jpg?t=lim+x%E2%86%921+sin%28x2-1%29%2Fx-1+sin%E4%B8%BA%E4%BB%80%E4%B9%88%E5%8F%AF%E4%BB%A5%E5%8E%BB%E6%8E%89lim%28x-%3E1%29%5Bsin%28x%5E2-1%29%2Fx-1%5D%3Dlim%28x-%3E1%29%5B%28x%5E2-1%29%2Fx-1%5D%3Dlim%28x-%3E1%29%28x%2B1%29%3D2+%E6%8B%85%E4%B8%8D%E6%98%8E%E7%99%BD%E4%B8%BA%E4%BB%80%E4%B9%88sin%E6%80%8E%E6%A0%B7%E5%8E%BB%E6%8E%89)
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