dy/dx,dy/dx,dydx,dydx,∂2∂x1∂x2y{\displaystyle dy/dx,\mathrm {d} y/\mathrm {d} x,{\frac {dy}{dx}},{\frac {\mathrm {d} y}{\mathrm {d} x}},{\frac {\partial ^{2}}{\partial x_{1}\partial x_{2}}}y}Admin User of Vigyanwiki.