Mathematics, 01.07.2021 14:00 10040813
In any triangle ABC, Prove by vector method c^2=a^2+b^2-2abcosC
Answers: 1
, 
and 
the vector of a triangle so that 
. By definition of Dot Product:
![\|\vec C\|^{2} = [\vec A \,\bullet \,(\vec A + \vec B)] + [\vec B\,\bullet \,(\vec A + \vec B)]](/tpl/images/1387/2564/16414.png)
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In any triangle ABC, Prove by vector method c^2=a^2+b^2-2abcosC...
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