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Let's do an exercise as warming up.Ex:Find lim x→0sin1/x.lim x→0sin1/x=lim1/x→∞sin1/x=lim t→∞sint(Let t=1/x).We know lim t→∞sint does not exist,so lim x→0sin1/x DNE.We can use graphing calculator to show the result is DNE(from figure 1to figure 8). 相似文献
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Yuxue Liang 《中学生数学》2010,(11):F0004-F0004
Do you remember the' composite function which is composed of two functions, we've learned. Such as f(x) =g(φ(x)) with φ(x) is called inside function and g(x) is called outside function. 相似文献
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For a function y= f(x) to have an inverse function, f must be one-to-one. Then for each x in its domian there is exactly one y in its range; furthermore, to each y in the range, there corresponds exactly one x in the domain. The correspondence from the range of f onto the domian of f is, therefore, also a function. It is this function that is the inverse of f. 相似文献