Q3 of 87 Page 10

In a ∆ABC, if then show that c = a.

Given,



By Sine Law,




By Cosine law,






As it given



So,



For the above Equation to be true,


(c2 -a2 )(sin (C) )2 =0


So


(c2 -a2 )=0


c=a


Hence Proved.


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1

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