高一数学公式 企业增资验资网 2025-10-07 tan(x+y)=sin(x+y)/cos(x+y)=sinxcosy+sinycosx/cosxcosysinxsiny=tanx+tany/1tanxtany；tan(xy)=sin(xy)/cos(xy)=sinxcosysinycosx/cosxcosy+sinxsiny=tanxtany/1+tanxtany... 阅读更多