In a triangle ABC, D is the middle point of BC. If AD is perpendicular to AC, then cosAcosC=

In a triangle ABC, D is the middle point of BC. If AD is perpendicular

1.	In a triangle ABC, D is the middle point of BC. If AD is perpendicular to AC, then cosAcosC=
Answer» In a triangle $A B C$ , $D$ is the middle point of $B C$ . If $A D$ is perpendicular to $A C$ , then $cos A cos C =$