This snippet demonstrates the polt format that I often used in Wolfram Mathematica.

Plot[Sin[x], {x, -Pi, Pi}, Mesh->None, PlotRange->{{-Pi, Pi}, {-2, 2}}, AspectRatio->9/16, PlotTheme->"Scientific", FrameStyle->Black, TicksStyle->Directive[FontSize->20], ImageSize->Large, AxesLabel->Automatic, LabelStyle->Directive[FontSize->20, FontFamily->"Times New Roman"], Epilog->{Text[Style[ ToExpression[ "y = 12 \\frac{\\partial^2 f(x)}{\\partial x^2}", TeXForm, HoldForm], FontFamily->"Times New Roman", FontSize->20, Bold, Black], Scaled[{.25, .80}]]}]

Here is the diagram,

Here is the Wolfram notebook (Ua98n5.nb) used in this post.

朱指导