Log lg ln sin cos tan △x It depends on your own pronunciation. As long as others know what you are reading, it's ok. Chinese is also divided into dialects.

Loglg: Lao Ge (fourth sound) (first sound)

Ln: lao (fourth sound) in (first sound)

Sin: sei in

Cos: kou chengzhai

Tan: Tan Ti

△x:δx