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In Solution of Traingle, How doess a*cos 2 (C/2) + c*cos 2 (A/2)= 3b/2 become a(1+cosC) + c(1+cosA)=3b?

 
In Solution of Traingle,
How doess a*cos2(C/2) + c*cos2(A/2)= 3b/2
become a(1+cosC) + c(1+cosA)=3b?

Grade:12

1 Answers

Rinkoo Gupta
askIITians Faculty 81 Points
9 years ago 
acos2(C/2)+c
cos2(A/2)=3b/2
2acos2(C/2)+2ccos2(A/2)=3b
a(1+cosC)+c(1+cosA)=3b
Using formula
2cos2x=1+cos2x

Thanks & Regards
Rinkoo Gupta
AskIITians Faculty

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