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a(cosC-cosB)=2(b-c)cos^2A/2...

`a(cosC-cosB)=2(b-c)cos^2A/2`

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In DeltaABC , prove that: a(cosC-cosB)=2(b-c)cos^(2)A/2

In DeltaABC , prove that: a(cosC-cosB)=2(b-c)cos^(2)A/2

In triangle ABC , prove that a(cosC-cosB)=2(b-c)cos^2.(A)/(2) .

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In DeltaABC , prove that: a(cosB+cosC)=2(b+c)sin^(2)A/2 .

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(b^2-c^2)/(cos B+cosC)+(c^2-a^2)/(cosC+cosA)+(a^2-b^2)/(cosA+cosB)=……

Show that in a triangle ABC, (b^2-c^2)/(cosB+cosC)+(c^2-a^2)/(cosC+cosA)+(a^2-b^2)/(cosA+cosB)=0

for any triangleABC show that (b^2-c^2)/(cosB+cosC)+(c^2-a^2)/(cosC+cosA)+(a^2-b^2)/(cosA+cosB)=0