Consider the numbers z=3√(2)(cos (135°)+isin (135°) and w=cos (180°)+isin (180°). Which expression is closest to the polar form of z+w ?
a. 5(cos (143°)+isin (143°))
b. 5(cos (315°)+isin (315°))
c. 4√(2)(cos (143°)+isin (143°))
d. 4√(2)(cos (315°)+isin (315°))