cosα+cosβ+cosγ+cos(α+β+γ)=4cos(α+β)2cosβ+γ2cosγ+α2 Video Solution| ShareSave Answer Step by step video & image solution for सिद्ध कीजिए की cos alpha+cos beta+cos gamma+cos (alpha+beta+gamma)= 4cos (alpha+beta)/2cos""(beta+gamma)...
Step by step video, text & image solution for If cos (alpha - beta) + cos (beta - gamma) + cos (gamma - alpha) = (-3)/(2) then prove that cos alpha + cos beta+ cos gamma = sin alpha + sin beta + sin gamma = 0. by Maths experts to help you in doubts & scoring excell...
百度试题 结果1 题目【题目】【题目】【题目】已知 _ ,【题目】【题目】已知 _ , \$\cos \alpha + \cos \beta + \cos \gamma = 0\$ 【题目】 相关知识点: 试题来源: 解析 【解析】 B 反馈 收藏
化简:(1)sin(\alpha +\beta )cos(\gamma -\beta )-cos(\beta +\alpha )sin(\beta -\gamma )=_
少经基率劳非何条所选立交\(\begin{vmatrix} 0&\cos \alpha&\cos \beta \\ -\cos \alpha&0&\cos \gamma\
1.化简: \$\sin ( \alpha + \beta ) \cos ( \gamma - \beta ) - \cos ( \beta + \alpha ) \si
\sin \beta \cos \gamma , \sin \gamma \cos \alpha \equiv\$ 值中,大 _ 【题目】已知 _ 是互不相同的锐角,则在【题目】已知 _ 是互不相同的锐角,则在 \$\sin \alpha \cos \beta , \sin \beta \cos \gamma , \sin \gamma \cos \alpha \equiv\$ 值中,大 _ 的个数的最大值是...
【题目】若 _ ,且【题目】若 _ ,且 \$\cos \alpha + \cos \beta + \cos \gamma = 0\$ 【题目】若 _ ,且
如图所示$,$D' C' A B cosa cosy C A cosB B构造一个长方体$ABCD-A'B'C'D'$,使其三边分别为$\cos \alpha $、$\cos \beta $、$\cos \gamma $,由且$\cos ^{2}\alpha +\cos ^{2}\beta +\cos ^{2}\gamma =1$知,其对角线长为$1$;由$C'D\bot AD$,$AA'\bot AC$,$...
【解析】 【解析】 \$\sin ( \alpha - \beta ) \sin ( \beta - \gamma ) - \cos ( \alpha - \beta ) \cos ( \gamma - \beta )\$ \$= \sin ( \alpha - \beta ) \sin ( \beta - \gamma ) - \cos ( \alpha - \beta ) \cos ( \beta - \gamma )\$ \$= - \cos...