5 2  X  K X  K    C). D). X 3 K26 66 6

2 , - BAI TRAC NGHIEM PHUONG TRINH LUONG GIAC 2 , - BAI TRAC NGHIEM PHUONG TRINH LUONG GIAC
BAI TRAC NGHIEM PHUONG TRINH LUONG GIAC
2 , 5 2 xk xk    C). D). x 3 k26 6x x sin cossin - cos 3