sin75度计算方法详细

殷功盲3943sin75°=?求详细过程.
钟邹养13945197801 ______ sin75=sin(45+30) =sin45cos30+sin30cos45 =√2/2x√3/2+1/2x√2/2 =√6/4+√2/4 =(√6+√2)/4 望采纳,谢谢

殷功盲3943sin75度多少?(详解) -
钟邹养13945197801 ______ sin75°=sin(45°+30°)=sin45°cos30°+cos45°sin30°=(√6+√3)/4

殷功盲3943求Sin75度 -
钟邹养13945197801 ______ Sin75度=sin(45度+30度) =sin45度cos30度+cos45度sin30度 =√2/2 * √3/2 + √2/2 * 1/2 =√2/2 *[(√3 + 1)/2] =(√6 + √2)/4

殷功盲3943求75度角的sin,cos,tan的值,有步骤,谢谢! -
钟邹养13945197801 ______ sin75° = sin(45° + 30°) = sin45° * cos30° + cos45° * sin30° = cos75° = cos(45° + 30°) = cos45° * cos30° - sin45° * sin30° = tan75° = tan(45° + 30°) = (tan45° + tan30°) / (1 - tan45° * tan30°) = 至于45° 、 30°的sin,cos,tan的值是已知的了...代进去就行了...

殷功盲3943三角函数问题我们知道,sin30度=1/2那么sin75度=?sin105度=?最好能告诉我是怎么算出来的, -
钟邹养13945197801 ______[答案] sin75=sin(45+30)=sin45cos30+cos45sin30=√2/2*√3/2+√2/2*1/2=(√6+√2)/4 sin105=sin(180-75)=sin75=(√6+√2)/4

殷功盲3943sin75度=? 做法和过程 -
钟邹养13945197801 ______ 方法1: 设sin75°=x,则cos75°=√(1 - x²) 因为cos2α=1 - 2sin²α 而cos150°=- √3/2 所以 - √3/2 = cos150°=1 - 2x² 8x² = 4 + 2√3 =(√3 + 1)² x = (√6 + √2) / 4 方法2: 因为sin(α + β)=sinαsinβ+cosαcosβ 所以sin75°=sin(30° + 45°)=sin30°sin45°+cos30°cos45° =1/2 * √2/2 + √3/2 * √2/2 = (√6 + √2) / 4 方法3: 几何法,利用外角定理、角平分线等,不再列举.

殷功盲3943sin75度多少?(详解) -
钟邹养13945197801 ______[答案] sin75°=sin(45°+30°)=sin45°cos30°+cos45°sin30°=(√6+√3)/4

殷功盲3943求sin75度的值 有过程是数学提 -
钟邹养13945197801 ______[答案] sin75 =sin(45+30) =sin45cos30+sin30cos45 =(√2/2)(√3/2+1/2) =√6/4+√2/4

殷功盲3943帮忙计算一下sin75° -
钟邹养13945197801 ______ sin75=sin(30+45) =sin30cos45+sin45cos30 =0.5*0.707+0.707*0.866 =0.966

殷功盲3943sin75°的算法
钟邹养13945197801 ______ 是公式 sin(A+B)=sinACOSB+sinBcosA