ABC is a triangle. D is the middle point of BC. If AD is perpendicular to AC, then prove that Cos A. 1 answer below »
ABC is a triangle. D is the middle point of BC. If AD is perpendicular to AC, then prove that Cos A cos C = 2(c^2– a^2) / 3ac
ABC is a triangle. D is the middle point of BC. If AD is perpendicular to AC, then prove that Cos A. 1 answer below »