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Vadim26 [7]
3 years ago
12

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

Mathematics
1 answer:
Mazyrski [523]3 years ago
3 0

Step-by-step explanation:

A. cos4x-sin4x=2-cos2x

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