B
bobe96


luong giac cuc ky kho
cos2x-cos6x+12sinx-16sin^3x+4=0
mih va thay giao bo tay r
ai lm dk mih ccom on nhieu


cos2x-cos6x+12sinx-16sin^3x+4=0
mih va thay giao bo tay r
ai lm dk mih ccom on nhieu