Proved that acosA+bcosB+ccosC=2asinBsinC please help sir
Aditya , 9 Years ago
Grade 11
Trigonometry> Proved that acosA+bcosB+ccosC=2asinBsinC ...
1 AnswersVikas TU
Use properties of triangles.
let area of triangle be Ar.
Then bcsinA= casinB = absinC = 2Ar
thus write all sin terms in terms of Ar.
and also use
a/sinA = b/sinB = c/sinC = k.
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