P is a point equidistant from point L and M intersecting at point A show that the line AP bisect the angle
(https://www.teachoo.com/3504/753/Ex-11.2--2---Show-line-(1---1--2)--(3--4---2)-is-perpendicular/category/Ex-11.2/)
But 1st we need to prove that lines are intersecting one's coz in 3d we have possibility of skew lines for which angle between lines has no meaning as it can't be found coz they don't intersect.
I have a suggestion for Q17 in ncert class 11 complex numbers and quadratic equations miscellaneous exercises on chapter 5
(Please bear with me for the image quality)
If we proceed in this way the answer would come quicker
Let R be the relation on the set N of natural numbers defined by R={(a,b):a+3b=12,a,bEN}