(start off array l Rightarrow sin Acos C + sin Ccos A = twocos Asin C Leftrightarrow sin Acos C = cos Asin C;(*)stop array )T?t C?Tin H?c L?p 6Tin H?c L?p 7Tin H?c L?p 8Tin H?c L?p 9Tin H?c L?p 10Tin H?c L?p 11Tin H?c L?p twelveT?t C?Th? D?c L?p tenth? D?c L?p eleventh? D?c L?p twelfth? D?c L?p sixth? D?c L?p seventh? D?c L?p 8Th? D?c L?p 9H? tr?i