If ˆ ˆ ˆ ˆ ˆ ˆ p i j k and q i – 2j k , find a vector of magnitude 5 3 units perpendicular to the vector q and coplanar with vectors p and q .
if a quadratic polynomial y=ax^2+bx+c intersects x axis at alpha and beta
In triangle ABC if O is the circum centre and H is the orthocentre then show that OA+OB+OC=OH, HA+HB+HC=OH???