vazyme+2x+taq+master+mix

傅侍旭4331计算tan55°tan35°+sin(70° - x)/cos(x+20°)+1的值. -
莘常牲17591791179 ______[答案] tan55°tan35°+sin(70°-x)/cos(x+20°)+1 =tan55°cot55°+cos[90-(70°-x)]/cos(x+20°)+1 =1+1+1 =3