Say we have the ecuations below a,b,c positive numbers(adsbygoogle = window.adsbygoogle || []).push({});

sin(A)=a/sqrt(a^2+b^2) 1

sin(B)=a/sqrt(a^2+c^2) 2

sin(A)cos(A)=sin(B)cos(B) 3

I realised that calculating cos(A) and cos(B) and then solving the third ecuations i get the solutions b=c and a^2=bc

But solving only sin(A)=sin(B) ( we get form 3 that A=B ) I get only b=c . I'd like to know where did the second solution go .... ??

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# Sine ecuations

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