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" 15."a^(3)cos(B-C)+b^(3)cos(C-A)+c^(3)c...

" 15."a^(3)cos(B-C)+b^(3)cos(C-A)+c^(3)cos(A-B)=3abc

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In any triangle ABC, prove that: a^(3)cos(B-C)+b^(3)cos(C-A)+c^(3)cos(A-B)=3abc

In Delta ABC, prove that a^(3)cos(B-C)+b^(3)cos(C-A)+c^(3)cos(A-B)=3abc

In any DeltaABC , prove that a^(3)cos(B-C)+b^(3)cos(C-A)+c^(3)cos(A-B)=3abc

In any DeltaABC , prove that a^(3)cos(B-C)+b^(3)cos(C-A)+c^(3)cos(A-B)=3abc

Prove that in /_ABC,a^(3)cos(B-C)+b^(3)cos(C-A)+c^(3)cos(A-B)=3abc

In any triangle ABC, prove that, a^(3) cos(B-C) + b^(3) cos(C-A) + c^(3) cos(A-B) = 3abc.

In Delta ABC prove that a^3cos(B-C) + b^3cos(C-A) + c^3 cos(A-B) = 3abc

In /_\ABC show that a^3cos(B-C)+b^3cos(C-A)+c^3cos(A-B)=3abc

Prove that in triangleABC, a^3cos(B-C)+b^3cos(C-A)+c^3cos(A-B)=3abc