cos2a + sina = 2sina + 2a
cm
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Tệ ok
Tôi xin lỗi nhưng hiện giờ tên này ko còn ở nick này nữa tôi xin lỗi vì thông báo đường đột này ạ
Tôi thật lòng xin lỗi !!
2sina + 2 a cm=4 sina cm
hihi đoán mò lẹ