GEO-METRY
Geometry
Level
3
In triangle ABC if the line joining the circumcentre and incentre is parallel to BC,then cosB+cosC=
The answer is 1.
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1 solution
Let BC parallel to IS
cosA+cosB+cosC=1+[r/R] =1+cosA
=>cosB+cosC=1//
r=>radius of incentre circle with centre I,
R=>radius of circumcentre circle with centre S
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