Can the target of the attack apply the bonus provided by cover when he is the target of a triangulated fire attack?
The description of the triangulated fire is very clear : Allows the user to declare a BS Attack with one of his BS Weapons against a target within LoF by making a BS-3 Roll, ignoring all other applicable MODs (Range, Cover, Special Skills such as Camouflage, TO, ODD...). All mods to your BS roll are ignored and replaced by a single -3. So yes, if your pathfinder dronbot shoot a target 1 meter away (-6 for range), in cover (-3 for cover), with ODD (-6) and in CC (-6), he will still shoot it on 8's As @colbrook said, the target will still have the +3 ARM/BTS bonus