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Discussion

Mathematics Preparation for Engineering Entrance
(5)

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Let the triangles ABC and DEF be inscribed in the same circle. If the triangles are of equal perimeter, then

 
cosA + cosB + cosC = cosD + cosE + cosF
sin2A + sin2B + sin2C = sin2D + sin2E + sin2F
the areas of the two triangles are the same

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Palak Sharma

I think second and fourth option is correct