QUESTION 1 Find the most general function M(x,y) or N(x,y) so that the given DE is exact: (yer 4xy+2) dx + N(x,y)dy = 0. W(x,y)=6x²y + n(x), h(x) is a function in only x b.N(x,y) = xeY (1 + y) +*+ gly), g(y) is a function in only y CN(x,y) = xey (1 + y)-x+ g(y), g() is a function in only y Cd. N(x,y)= - 6x?y? + n(x), h(x) is a function in only x