Latex Commands - Calculus

Symbol	Command
$X\cdot Y$	X \\cdot Y
${\frac {d}{dx}}\left(x^{2}\right)=2x$	\\frac{d}{dx}\left(x^2\\right) = 2x
$\int 2x\,dx=x^{2}+C$	\\int 2x\,dx = x^2+C
$\int _{1}^{5}2x\,dx=24$	\\int^5_1 2x\,dx = 24
$\int _{1}^{5}2x\,dx=24$	\\displaystyle\int^5_1 2x\,dx = 24
${\frac {\partial ^{2}U}{\partial x^{2}}}+{\frac {\partial ^{2}U}{\partial y^{2}}}$	\\frac{\\partial^2U}{\\partial x^2} + \\frac{\\partial^2U}{\\partial y^2}
${\frac {1}{4\pi }}\oint _{\Sigma }{\frac {1}{r}}{\frac {\partial U}{\partial n}}ds$	\\displaystyle \\frac{1}{4\pi} \\oint_\\Sigma\\frac{1}{r}\frac{\partial U}{\partial n} ds