sin15+cos15度等于多少

陈叶服3731sin15度+cos15度等于多少
卢聂秋13637126463 ______ sin(15°)+cos(15°) = 1.2247448713916

陈叶服3731(sin15度+cos15度)/(sin15度 - cos15度)的值是? -
卢聂秋13637126463 ______[答案] 即 (sin15+cos15)/(sin15-cos15) =(sin15+cos15)²/(sin²15-cos²15)——分子分母乘以(sin15+cos15) =(1+2sin15cos15)/(-cos30) =(1+sin30)/(-cos30) =(1+1/2)/(-√3/2) =-3/2*2/√3 =-√3

陈叶服3731sin15度+cos15度等于
卢聂秋13637126463 ______ (sin 15+cos 15)^2 =(sin 15)^2+(cos 15)^2+2*sin 15 * cos 15 =1+sin 30 =1+0.5 =1.5sin15+cos15=根号1.5=2根号6

陈叶服3731cos15度+sin15度=多少? -
卢聂秋13637126463 ______ sin15度*cos15度= (1/2)*2sin15度*cos15度=(1/2) sin30度=1/4

陈叶服3731cos15度+sin15度 等于多少 -
卢聂秋13637126463 ______ cos15+sin15=根号2(cos15sin45+sin15cos45)=根号2*sin(15+45)=根号2sin60=(根号6)/2 度全省了,自己加上去吧^_^

陈叶服3731cos15度+sin15度=多少? -
卢聂秋13637126463 ______[答案] (sin15+cos15)^2=1+2sin15cos15=1+sin30=1+1/2=3/2

陈叶服3731(sin15度+cos15度+1)(sin15度+cos15度 - 1) -
卢聂秋13637126463 ______[答案] 原式=(sin15+cos15)^2-1 =1+sin30-1 =sin30 =1/2

陈叶服3731sin15度cos15度=? -
卢聂秋13637126463 ______[答案] sin15cos15=sin30/2=1/4

陈叶服3731(cos15度—sin15度)/(cos15度+sin15度) -
卢聂秋13637126463 ______[答案] (cos15度—sin15度)/(cos15度+sin15度) =(1—tan15度)/(1+tan15度) =(tan45°—sin15°)/(1+tan45°tan15°) =tan(45°-15°) =tan30° =√3/3 希望可以帮到你.

陈叶服3731sin15度和cos15度的值是多少? -
卢聂秋13637126463 ______[答案] SIN15º=SIN(60º-45º)=SIN60ºCOS45º-SIN45ºCOS60º=(√6-√2)/4 COS15º=COS(60º-45º)=COS60ºCOS45º+SIN60ºSIN45º=(√6+√2)/4 这是我在静心思考后得出的结论, 如果不能请追问,我会尽全力帮您解决的~ 如果您有所不...