Arccosine
反余弦
🗣️ 情景例句
Please excuse me. I'm very sorry.
请原谅我， 我真的很不好意思。
For my math requirements, I'll be taking algebra, calculus, and trig.
数学的必修学分预定选代数、微积分、三角法。
But I'm determined to enjoy myself as much as possible, even though I can't see everything.
但是尽管我不可能什么都看，我都决定要玩个痛快！