(acosA+bsinA)^2+(asinA-bcosA)^2=a^2 +b^2

Why did students gather in tiananmen square on june 4, 1989? on june 4, 1989, students gathered in tiananmen square to mourn the death of the pro-reform leader

Which of the following wrote detailed accounts about early native american? a) spanish b) french c) americans d) mexicansi need this !

Many blacks moved from the south to northern cities during world war li looking for employment. after the war, a number of them lost their jobs. why did this happen?