Prove that a.cosA + b.cosB + c.cosC = 4RsinAsinBsinC| PROPERTIES OF TRIANGLES| INTERMEDIATE 1st YEAR

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In triangle A B C ,\nif cosA+cosB+cosC=7/4, t h e n R/r\nis equal to\n3/4\n (b) 4/3\n (c) 2/3\n ... In triangle A B C ,\nif cosA+cosB+cosC=7/4, t h e n R/r\nis equal to\n3/4\n (b) 4/3\n (c) 2/3\n ...
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