18 question of miscellaneous of integrals
ABC and DBC are two equilateral Triangles such that D is the midpoint of BC ratio of the areas of the triangle ABC and DBC Insas
Prove that that line of intersection of planes 5x+2y-4z+2 and 2x+8y+2z-1 is parallel to tha plane 4x-2y-5z-2