khanhhuyenn152 khanhhuyenn152

25-07-2021
Mathematics

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: Đẳng thức nào sau đây đúng ?
A. cos4x – sin4x = 2-cos2x B. cos4x – sin4x = 1+2sin2x

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ani3946 ani3946

25-07-2021

Step-by-step explanation:

A. cos4x-sin4x=2-cos2x

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