1.

A triangle ABC exists such that

Answer»

`(b+C+a)(b+c-a)=5bc`
the sides are of lengths `sqrt19, sqrt38, sqrt116`
`cos ((b ^(2)-c^(2))/(a ^(2)))+((c^(2)-a^(2))/(b ^(2)))+((a^(2)-b^(2))/(c^(2)))=0`
`cos ((B-C)/(2))=(SIN B+ sin C) cos ((B+C)/(2))`

Answer :D


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