In any triangle, ABC prove that: `ac cos B-bc cos A=a^2-b^2`

In any triangle ABC, prove that: a cos A+b cos B+c cos C=2a sin B sin C

For any triangle ABC,prove that a(b cos C-c cos B)=b^(2)-c^(2)

For any triangle ABC,prove that a cos A+b cos B+c cos C=2a sin B sin C

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

In any triangle ABC, prove that: (1+cos(A-B)cos C)/(1+cos(A-C)cos B)=(a^(2)+b^(2))/(a^(2)+c^(2))

If theta is any real number, then, in a triangle ABC, prove that a cos (B - theta) + b cos (A + theta) = c cos theta .

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

In any triangle ABC, prove that following: quad b cos B+c cos C=acos(B-C)

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

In any ABC, prove that: 2(bosA+ca cos B+ab cos C)=a^(2)+b^(2)+c^(2)