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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 ...

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