六年级数学三角函数公式整理两角和公式sin=sinAsB+sAsinBsin=sinAsB-sinBsAs=sAsB-sinAsinBs=sAsB+sinAsinBtan=/tan=/tg=/tg=/倍角公式tan2A=2tanA/tg2A=/2tgas2a=s2a-sin2a=2s2a-1=1-2sin2a半角公式sin=/2)sin=-/2)s=/2)s=-/2)tan=/)tan=-/)tg=/)tg=-/)和差化积2sinAsB=sin+sin2sAsinB=sin-sin2sAsB=s-sin-2sinAsinB=s-ssinA+sinB=2sin/2)s/2sA+sB=2s/2)sin/2)tanA+tanB=sin/sAsBtanA-tanB=sin/sAsBtgA+tgBsin/sinAsinB-tgA+tgBsin/sinAsinB
