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Proved that acosA+bcosB+ccosC=2asinBsinC please help sir

Proved that acosA+bcosB+ccosC=2asinBsinC please help sir

Grade:11

1 Answers

Vikas TU
14149 Points
4 years ago
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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