Backup software that works - SyncBackPro and SyncBackSE
Company Description:
backup software for the pc: powerful, easy to use backup software for backing up and synchronising files on a local/network drive, ftp server and more.
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为什么正切符号弃用tg而改用tan? - 知乎 像塞尔维亚、保加利亚、乌克兰、俄罗斯等等国家都在用tg，但天朝和国际（XXXX）接轨了。 看一眼俄罗斯wiki上的一个说明吧： В западной литературе тангенс, котангенс и косеканс обозначаются {\displaystyle \tan x,\cot x,\csc x}