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cos(A−C)cos(B)+cos(2B)=0\cos(A-C)\cos(B)+\cos(2B)=0cos(A−C)cos(B)+cos(2B)=0 Then a2,b2 and c2a^{2},b^{2} \text{ and }c^{2}a2,b2 and c2 are in-
Clarification: A,B and CA,B \text{ and }CA,B and C are angles of triangle, a,b and ca,b \text{ and }ca,b and c are sides opposite to angles A,B and CA,B \text{ and } CA,B and C respectively.
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