问题描述：
英语翻译
the graph of ch(x) is the graph of h(x) stretched vertically by a factor of c if c>1 the graph of ch(x) is the graph of h(x) shrunk vertically by a factor of c if 0
the graph of ch(x) is the graph of h(x) stretched vertically by a factor of c if c>1 the graph of ch(x) is the graph of h(x) shrunk vertically by a factor of c if 0
问题解答：
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