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Hemanth Sai Grade: 11
        

if sinA+sinB= root3(cos B-cos A) them sin3B+sin3A =

6 years ago

Answers : (1)

Askiitians_Expert Yagyadutt
askIITians Faculty
74 Points
										

Hello Hemanth


 


SinA + sinB = root3(cosB) - root3(cosA)


 


sinA + root3.cosA  =  root3cosB - sinB


 


Multiply by 1/2


 


1/2 sinA + root3/2 cosA = root(3)/2 cosB - 1/2 sinB


 


sin ( A + 60) = sin ( 60 - B)


 


so A + 60 = 60 - B


 


or  A = -B


 


So  Sin3B + sin3A = sin3B - sin3B = 0


 


Ans


 


With regards


Yagya


askiitians_expert

6 years ago
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