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" 2."quad a^(2)cos2B+b^(2)cos2A+2ab cos(...

" 2."quad a^(2)cos2B+b^(2)cos2A+2ab cos(A-B)=c^(2)

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a ^ (2) cos2B + b ^ (2) cos2A + 2ab cos (AB) =

a ^ (2) cos2B + b ^ (2) cos2A + 2ab cos (AB) = c ^ (2)

a ^ (2) cos2B + b ^ (2) cos2A + 2ab cos (AB) = c ^ (2)

In a DeltaABC, a ^(2) cos 2B+b^(2) cos 2A+2ab cos (A-B)=

In a DeltaABC, a ^(2) cos 2B+b^(2) cos 2A+2ab cos (A-B)=

In a DeltaABC, a ^(2) cos 2B+b^(2) cos 2A+2ab cos (A-B) is equal to?

a ^ (2) cos (2B) + b ^ (2) cos (@A) + 2ab cos (AB) = c ^ (2)

a^(2)(cos^(2)B-cos^(2)C)+b^(2)(cos^(2)C-cos^(2)A)+c^(2)(cos^(2)A-cos^(2)B)=0

In any Delta ABC, prove that :a^(2)(cos^(2)B-cos^(2)C)+b^(2)(cos^(2)C-cos^(2)A)+c^(2)(cos^(2)A-cos^(2)B)=0

(iv) a^(2)(cos^(2) B - cos^(2)C) + b^(2) (cos^(2) C- cos^(2)A) + c^(2) (cos^(2)A- cos^(2)B)=0