锟斤拷锟斤拷锟絋锟斤拷(d锟斤拷o)锟斤拷式記锟斤拷锟紼锟絒锟斤拷锟斤拷變偶锟斤拷變锟斤拷锟斤拷號(h锟斤拷o)锟斤拷锟斤拷锟斤拷

锟斤拷锟斤拷锟絝锟杰癸拷式

锟斤拷锟斤拷sinα=2tan锟斤拷α/2锟斤拷/锟斤拷1+tan锟睫ｏ拷α/2锟斤拷锟斤拷

锟斤拷锟斤拷cosα=锟斤拷1-tan锟睫ｏ拷α/2锟斤拷锟斤拷/1+tan锟睫ｏ拷α/2锟斤拷锟斤拷

锟斤拷锟斤拷tanα=2tan锟斤拷α/2锟斤拷/锟斤拷1-tan锟睫ｏ拷α/2锟斤拷锟斤拷

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷式

锟斤拷锟�锟斤拷锟�1锟斤拷锟斤拷sinα锟斤拷^2+锟斤拷cosα锟斤拷^2=1

锟斤拷锟斤拷锟斤拷2锟斤拷1+锟斤拷tanα锟斤拷^2=锟斤拷secα锟斤拷^2

锟斤拷锟�锟斤拷锟�3锟斤拷1+锟斤拷cotα锟斤拷^2=锟斤拷cscα锟斤拷^2

锟斤拷锟斤拷锟紺锟斤拷锟斤拷锟斤拷锟绞�锟斤拷只锟借將一式锟斤拷锟斤拷锟斤拷同锟斤拷锟斤拷sinα锟斤拷^2锟斤拷锟节讹拷锟斤拷(g锟斤拷)锟斤拷锟斤拷cosα锟斤拷^2锟斤拷锟斤拷

锟斤拷锟�锟斤拷锟�4锟斤拷锟斤拷(du锟斤拷)锟斤拷锟斤拷锟斤拷锟街憋拷锟斤拷锟斤拷锟斤拷锟�锟斤拷锟斤拷锟斤拷

锟斤拷锟斤拷tanA+tanB+tanC=tanAtanBtanC

锟斤拷锟斤拷锟紺锟斤拷

锟斤拷锟斤拷A+B=π-C

锟斤拷锟斤拷tan锟斤拷A+B锟斤拷=tan锟斤拷π-C锟斤拷

锟斤拷锟�锟斤拷锟絫anA+tanB锟斤拷/锟斤拷1-tanAtanB锟斤拷=锟斤拷tanπ-tanC锟斤拷/锟斤拷1+tanπtanC锟斤拷

锟斤拷锟斤拷锟斤拷锟斤拷锟缴碉拷

锟斤拷锟斤拷tanA+tanB+tanC=tanAtanBtanC

锟斤拷锟斤拷锟斤拷锟紺

锟斤拷锟斤拷同锟接匡拷锟皆碉拷锟紺锟斤拷锟斤拷(d锟斤拷ng)x+y+z=nπ锟斤拷n∈Z锟斤拷锟絩(sh锟斤拷)锟斤拷該锟絇(gu锟斤拷n)系式也锟斤拷锟斤拷

锟斤拷锟斤拷锟斤拷tanA+tanB+tanC=tanAtanBtanC锟缴得筹拷锟斤拷锟铰結(ji锟斤拷)論

锟斤拷锟�锟斤拷锟�5锟斤拷cotAcotB+cotAcotC+cotBcotC=1

锟斤拷锟斤拷锟斤拷6锟斤拷cot锟斤拷A/2锟斤拷+cot锟斤拷B/2锟斤拷+cot锟斤拷C/2锟斤拷=cot锟斤拷A/2锟斤拷cot锟斤拷B/2锟斤拷cot锟斤拷C/2锟斤拷

锟斤拷锟�锟斤拷锟�7锟斤拷锟斤拷cosA锟斤拷^2+锟斤拷cosB锟斤拷^2+锟斤拷cosC锟斤拷^2=1-2cosAcosBcosC

锟斤拷锟�锟斤拷锟�8锟斤拷锟斤拷sinA锟斤拷^2+锟斤拷sinB锟斤拷^2+锟斤拷sinC锟斤拷^2=2+2cosAcosBcosC

锟斤拷锟�锟斤拷锟�9锟斤拷sinα+sin锟斤拷α+2π/n锟斤拷+sin锟斤拷α+2π*2/n锟斤拷+sin锟斤拷α+2π*3/n锟斤拷+……+sin[α+2π*锟斤拷n-1锟斤拷/n]=0

锟斤拷锟斤拷cosα+cos锟斤拷α+2π/n锟斤拷+cos锟斤拷α+2π*2/n锟斤拷+cos锟斤拷α+2π*3/n锟斤拷+……+cos[α+2π*锟斤拷n-1锟斤拷/n]=0锟皆硷拷

锟斤拷锟斤拷sin^2锟斤拷α锟斤拷+sin^2锟斤拷α-2π/3锟斤拷+sin^2锟斤拷α+2π/3锟斤拷=3/2

锟斤拷锟斤拷tanAtanBtan锟斤拷A+B锟斤拷+tanA+tanB-tan锟斤拷A+B锟斤拷=0

锟斤拷锟斤拷锟絇(gu锟斤拷n)锟斤拷锟絔锟斤拷

       锟竭讹拷锟斤拷(sh锟斤拷)锟絎(xu锟斤拷)锟斤拷(f锟斤拷)锟斤拷(x锟斤拷)锟斤拷锟斤拷锟絉锟斤拷

锟斤拷锟铰高匡拷锟結訊锟斤拷锟竭匡拷锟斤拷锟竭★拷锟斤拷前锟斤拷(zh锟斤拷n)锟斤拷锟斤拷志愿锟斤拷锟�(b锟斤拷o)锟斤拷锟饺★拷锟�?j锟斤拷n)?sh锟斤拷)锟斤拷锟斤拷

锟竭匡拷锟絩(sh锟斤拷)锟絞锟斤拷锟斤拷全锟斤拷锟斤拷要锟斤拷(ji锟斤拷)锟絚(di锟斤拷n)

锟組锟斤拷"锟竭匡拷锟絎(w锟斤拷ng)"微锟脚癸拷锟斤拷號(h锟斤拷o)