In a `Delta ABC ,a(cos^2B+cos^2C)+cosA(c cosC+bcosB)=`

In a DeltaABC , a(cos^(2)B+cos^(2)C)+cosA( c cosC+bcosB)=

In a DeltaABC , a(cos^(2)B+cos^(2)C)+cosA( c cosC+bcosB)=

In a Delta ABC, a (cos^2 B+cos^2 C)+cos A(c cos C+b cos B)=

In a Delta ABC,a(cos^(2)B+cos^(2)C)+cos A(c cos C+b cos B) is equal to

cos^2 A + cos^2 B +cos^2 C=1+2cosA cosB cosC .

In a triangle ABC , acosB + b cosC + c cosA =(a+b+c)/2 then

In a triangle ABC , acosB + b cosC + c cosA =(a+b+c)/2 then

In any triangle ABC, if (cosB+ 2 cosA)/(cos B + 2cosC ) = (sin C)/(sinA) then prove that, the triangle is either isosceles or right angled.

If A+B+C=180^0 , prove that : cos^2 A + cos^2 B + cos^2 C + 2cosA cosB cosC=1 .