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leha18091959
2 năm trước
Giải phương trình: 1. Cos²x - sin²x + 1 = 0 2. Sin²2x + cos²3x = 1 3. Sin² ( x - pi/4 ) = cos²x 4. |cos(2x-1)|= 1 5. 2sin2x + 5cosx = 0 Giúp tôi với
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