I’m not sure how to proceed with the following question. Could anyone help me? Thanks.
Write down a (vector) equation for the right-angled cone centered around the line $$x = y = z$$ in three-dimensional space by finding an equation satisfied by all vectors (x, y, z) which make an angle of $\pi/4$ radians with the vector $$(1,1,1)$$ which points along that line.
:/ Any help would be greatly appreciated. (: