If f is defined by f(x,y)=(8)/(3)x³+2x²+2xy+y²+y, locate the critical points of f.
((1)/(2),0),(-(1)/(4),(3)/(4))
(2)
(-(1)/(2),0),((1)/(4),-(3)/(4))((1)/(2),0),((1)/(4),-(3)/(4))(-(1)/(2),0