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结论是：1-cos2x等于2*(sinx)^2，这是通过三角恒等变换得到的。1-cos2x可以写为2sin²x，也可以表示为2cos²x-1，或者1-2(1-cos²x)。这些公式展示了二倍角公式在数学三角函数中的应用，它们通过将一个角的三角函数值转化为其两倍角的表达式，简化了复杂的计算，尤其 ...

正式文体的层次标号，如一、（一）、1、（1）、①等等这些该怎么排列第一层为“一、二、三”，第二层为”（一） （二） （三）“，第三层为1、2、3，第四层为（1）（2）（3），第五层为①②③。

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