(start out array l Rightarrow sin Acos C + sin Ccos A = 2cos Asin C Leftrightarrow sin Acos C = cos Asin C;(*)finish array )H? tr?i nghi?m, h??ng nghi?p 9 SGK Ho?t ??ng tr?i nghi?m, h??ng nghi?p - K?t n?i tri th?cT?t C?Th? D?c L?p 10Th? D?c L?p 11Th? D?c L?p 12Th? D?c L?p sixth? D?c L?p 7Th? D?c L?p 8Th? D?c L?p 9        …………………�… Read More