-50 + 20=
differentiate -2xe^(-2x) + e^(-2x)
lim(x,y)->(1,0)
2C+E=17
2E+C=19
E+C-CAMERA=10
2C+CAMERA=12
E=?
differentiate - 2 x e^(-2x) + e^(- 2 x)
differentiate xe^(-2x)
diffrentiate xe^-2x
3*3-3/3+3
(x+3)^2 + (x+4)^2