" In a triangle "ABC" ,prove that for any angle "0,b cos(A-theta)+a cos(B+theta)=c cos theta

In a triangle ABC, prove that for any angle theta,b cos(A-theta)+a cos(B+theta)=C cos theta

In a triangle ABC, prove that for any angle theta, b cos (A - theta) + a cos (B + theta) = C cos theta .

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 Delta ABC, b cos (C+ theta)+c cos (B- theta)=

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

In any triangle ABC, prove that a cos A+b cos B +c cos C =(8 triangle^(2))/(abc) .

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

If in a triangle ABC, theta is the angle determined by cos theta=(a-b)//c , then