If the incircel of the triangle ABC, through it's circumcentre, then the `cos A + cos B + cos C` is

In a triangle ABC,the line joining the circumcentre and incentre is parallel to BC, then cos B+cos C is equal to:

In a triangle ABC, cos A+cos B+cos C=

In a triangle ABC, cos A+cos B+cos C=

In a triangle ABC,cos A+cos B+cos C

In a triangle ABC, a cos A+b cos B+ c cos C=

In a triangle ABC , the line joining the circumcentre and incentre is parallel to BC, then Cos B + Cos C is equal to:

In a triangle ABC , the line joining the circumcentre and incentre is parallel to BC, then Cos B + Cos C is equal to:

The orthocentre of the triangle ABC is 'B' and the circumcentre is 'S' (a, b). If A is the origin, then th co-ordinates of C are