" 2.Uning Vector brove that "a=b cos c+c cos B

In any triangle ABC, then by vectors, prove that : a=b cos C+c cos B .

In triangle ABC , prove that (1) a=b cos C+c cos B (2) b=a cos C+c cos A .

In any o+ABC, prove that: (b+c)cos A+(c+a)cos B+(a+b)cos C=a+b+c

In any triangle ABC, prove that : (b + c) cos A + (c + a) cos B + (a + b) cos C=a+b+c .

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

Use vectors to prove that in triangleABC : a=bcos C+c cos B .

In Delta ABC, prove that :(c-b cos A)/(b-c cos A)=(cos B)/(cos C)

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

In any DeltaABC , prove that : (cos A)/(b cos C + c cos B) + (cos B)/(c cos A + a cos C) + (cos C)/(a cos B + b cos A) = (a^2 + b^2 + c^2)/(2abc)