If ABC is a right angled triangle, then the value of `(cos ^(2)A +cos ^(2) B+ cos ^(2)C)` is -

ABC is a right angled triangle with angleA=90^(@) .Then the value of cos^(2)A+cos^(2)B+cos^(2)C is :

If Delta ABC is right angled at C, then find the value of cos (A + B)

If A,B,C are the angles of a right angled triangle,then (cos^(2)A+cos^(2)B+cos^(2)C) equals

If A, B, C are the angles of a right angled triangle, then (cos^2A+ cos^2B+ cos^2C) equals

In Delta ABC right angled at C, find the value of cos (A + B).

In a triangle ABC the maximum value of (a cos^(2)A//2 +b cos^(2)B//2+cos^(2)C//2)/(a+b+c) is

If A,B,C are the angles of triangle ABC, then the minimum value of |{:(-2,cos C , cos B),(cos C , -1, cos A ) , (cos B , cos A , -1):}| is equal to :

If A,B,C are the angles of triangle ABC, then the minimum value of |{:(-2,cos C , cos B),(cos C , -1, cos A ) , (cos B , cos A , -1):}| is equal to :

In triangle ABC,/_C=(2 pi)/(3) then the value of cos^(2)A+cos^(2)B-cos A*cos B is equal

In a triangle ABC,cos^(2)A+cos^(2)B+cos^(2)C=