Sử dụng tọa độ cực để tính giá trị tích phân sau:  
2
2
3 9
3 2
0 9
x
x
x xy dydx

 


Which statement accurately explains whether a reflection over the x-axis and a 180° rotation would map figure acb onto itself?

Prove that quadrilateral is a rhombus.

At the beginning of 1974/75,2 years a man invested #2000 in a bank at 12.5% compound interest, if it degree #650 at the end of each two years to pay his son's school fees, after payment of interest to pay his son's school fees, how much did he have left at the beginning of the 1978/79 school year?