In LaTeX all "operators" (in LaTeX sense) must be printed upright and with a proper spacing around; to do so, their names are escaped
(some notations are not introduced as macros; one can introduce them but this is
more advanced staff) | * | type | produces | | Incorrect | ln(sin x ) | $ln (sin x)$ | | Correct | \ln(\sin x) | $\ln(\sin x)$ |
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