Evaluate lim(x,y)(0,0) x3+15x2+3y25x2+y2\displaystyle \lim_{{{\left({x},{y}\right)}\rightarrow{\left({0},{0}\right)}}}\ {\frac{{{x}^{{3}}+{15}{x}^{{2}}+{3}{y}^{{2}}}}{{{5}{x}^{{2}}+{y}^{{2}}}}} =

Use DNE for does not exist, oo for infinity or -oo for negative infinity.