standard function name

preview	method	preview	method	preview	method	preview	method
`KaTeX:\arccos`	`\arccos`	`KaTeX:\arcsin`	`\arcsin`	`KaTeX:\arcsin`	`\arcsin`	`KaTeX:\arg`	`\arg`
`KaTeX:\cos`	`\cos`	`KaTeX:\cosh`	`\cosh`	`KaTeX:\cot`	`\cot`	`KaTeX:\coth`	`\coth`
`KaTeX:\csc`	`\csc`	`KaTeX:\deg`	`\deg`	`KaTeX:\det`	`\det`	`KaTeX:\dim`	`\dim`
`KaTeX:\exp`	`\exp`	`KaTeX:\gcd`	`\gcd`	`KaTeX:\hom`	`\hom`	`KaTeX:\inf`	`\inf`
`KaTeX:\ker`	`\ker`	`KaTeX:\lg`	`\lg`	`KaTeX:\lim`	`\lim`	`KaTeX:\liminf`	`\liminf`
`KaTeX:\limsup`	`\limsup`	`KaTeX:\ln`	`\ln`	`KaTeX:\log`	`\log`	`KaTeX:\max`	`\max`
`KaTeX:\min`	`\min`	`KaTeX:\Pr`	`\Pr`	`KaTeX:\sec`	`\sec`	`KaTeX:\sin`	`\sin`
`KaTeX:\sinh`	`\sinh`	`KaTeX:\sup`	`\sup`	`KaTeX:\tan`	`\tan`	`KaTeX:\tanh`	`\tanh`

:-	:-	:-	:-
Correct:	`\tan(at-n\pi)`	`KaTeX:\rightarrow`	`KaTeX:\tan(at-n\pi)`
Incorrect:	`tan(at-n\pi)`	`katex:\rightarrow`	`KaTeX:tan(at-n\pi)`

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