Web⇒(a−b) 2+(b−c) 2+(a−c) 2=0 Since, all the three terms in the above addition are positive which cannot be summed up to zero. Therefore, (a−b)=(b−c)=(c−a)=0 ⇒a=b=c Thus, A=B=C=60 o=sin 2A+sin 2B+sin 2C=3× 43= 49 Video Explanation Solve any question of Determinants with:- Patterns of problems > Was this answer helpful? 0 0 Similar questions Web在考试中,常常会出现向量和三角形结合的题目,一般难度中上,并且不太好找到思路。. 老师可能都讲过这样一个结论:. 若 G 是 ABC 的重心,则 \overrightarrow {GA}+\overrightarrow {GB}+\overrightarrow {GC}=\overrightarrow {0} 。. 但当点在三角形内动起来,成为任意点 P …
If in a ΔABC, (1, sinA, sin^2A), (1, sinB, sin^2B), (1, sinC, sin^2C ...
Websin 2 A ( 1 − cos 2 B) + sin 2 B ( 1 − cos 2 A) = 2 sin 2 A sin 2 B This last equation is true since 1 − cos 2 = sin 2. So going backwards in the above steps, one obtains the original equation sin 2 A + sin 2 B − sin 2 C = 2 sin A sin B sin C as desired. Share Cite Follow answered Jul 31, 2012 at 19:07 Zarrax 43.4k 2 66 124 Add a comment 0 Use: sin WebDec 7, 2024 · If in a ΔABC, (1, sinA, sin2A), (1, sinB, sin2B), (1, sinC, sin2C) = 0, then the triangle is (A) Equilateral or isosceles (B) Equilateral or right angled (C) Right angled or isosceles (D) None of these matrices determinants jee jee mains Share It On Facebook Twitter Email 1 Answer +1 vote answered Dec 7, 2024 by Rozy (42.1k points) cynthia flanders/atlanta
已知 ABC中,sin2A=sin2B+sin2C+sinBsinC,则A=( ) A. π6 B.
WebFind many great new & used options and get the best deals for Trinity of Sin Pandora #2A VF 2013 Stock Image at the best online prices at eBay! Free shipping for many products! WebAug 7, 2013 · 2015-09-26 为什么sin2A=sin2B 要详细的解答 2013-01-28 ABC中,sin2A=sin2B+sin2C,则 ABC为 56 2012-07-18 在三角形ABC中 A>B 则以下四个不等式中不一定正确? Web在 ABC中,若sin A=2sin Bcos C,且sin2A=sin2B+sin2C,试判断 ABC的形状. 【思路点拨】 利用正弦定理将角的关系式sin2A=sin2B+sin2C转化为边的关系式,从而判断 ABC的形状. RTX讨论六: 已知两边及夹角,怎样求三角形面积? 证明: 数学建构. 三角形面积公 … cynthia fleming crawford