A:Why do you like winter?
B:What can we do in winter?
发展中国家之间的互助合作称为( )
设函数f(x)=2cos(ωx+φ)对任意的x都有fπ4+x=fπ4-x,若设函数g(x)=3sin(ωx+φ)﹣1,则gπ4的值是____
__________ I get a job will I have enough money to support my family.