QJEEAdv78Ma3603: JEE Advanced 1978 Mathematics - Class 12 JEEAdv78Ma3603 Solution: From a point inside a triangle perpendiculars , are drawn to…

From a point $O$ inside a triangle $ABC,$ perpendiculars $OD$ , $OE, OF$ are drawn to the sides $BC, CA, AB$ respectively. Prove that the perpendiculars from $A, B, C$ to the sides $EF, FD, DE$ are concurrent.