LaTeX double integral symbols

\iint f(x)dxdy \\~\\
\iint f(x) dxdy \\~\\
\iint f(x) \ dxdy \\~\\
\iint f(x) \, dxdy \\~\\
\iint f(x) \ dx \ dy \\~\\
\iint f(x) \, dx \, dy

\[ \iint f(x)dxdy \\~\\ \iint f(x) dxdy \\~\\ \iint f(x) \ dxdy \\~\\ \iint f(x) \, dxdy \\~\\ \iint f(x) \ dx \ dy \\~\\ \iint f(x) \, dx \, dy \]

Domain

\iint_{D} f(x) \, dx \, dy

\[ \iint_{D} f(x) \, dx \, dy \]

Definite integral

\int_{0}^{5} \int_{-2}^{2} xy dxdy \\~\\
\int_{0}^{5} \! \int_{-2}^{2} xy dxdy \\~\\
\int_{0}^{5} \!\! \int_{-2}^{2} xy dxdy

\[ \int_{0}^{5} \int_{-2}^{2} xy dxdy \\~\\ \int_{0}^{5} \! \int_{-2}^{2} xy dxdy \\~\\ \int_{0}^{5} \!\! \int_{-2}^{2} xy dxdy \]