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cos2x等于多少

2024-04-01 21:20 阅读了

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cos2x等于多少

cos2x = 2cos²x - 1

As mentioned earlier, cos2x can be expressed in different forms depending on the trigonometric identity used. Here are some examples:

cos2x = 1 - 2sin²x (using the identity cos²x + sin²x = 1)

cos2x = 2cos²x - 1 (using the identity cos²x + sin²x = 1)

cos2x = cos²x - sin²x (using the identity cos2x = cos²x - sin²x)

cos2x = 1 - 2cos²x (using the identity cos²x + sin²x = 1)

Without additional information or context, it is not possible to determine the exact value of cos2x.

cos2x

=cos²x-sin²x

=2cos²x-1

=1-2sin²x

=(1-tan²x)/(1+tan²x)即cos2x=1-2sinx的平方。

其他拓展公式

cos2x=cos²x-sin²x

cos2x=1-2sin²x

cos2x=2cos²x-1

cos2x=1-(1-2sin²x)=2sin²x

cos3a=cos(2a a)

cos2x等于多少

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