LaTeX uses straight stereo in a mathematical environment

Normal environment Mathematical environment Adjusted math environment Code
sin (x) s i n ( x ) sin(x) s i n ( x ) sin ⁡ (x) \ sin (x) sin ( x ) \ sin (x)
ln (x) ln (x) ln (x) l n ( x ) ln ⁡ (x) \ ln (x) ln ( x ) \ ln (x)
dx d x dx dx d x \mathrm{d}x dx \mathrm{d})

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Origin blog.csdn.net/Infinity_07/article/details/111300287