sir tan 45 =1 then why hav u taken it as root 2 and secondly if we have to consider only magnitude in slope then too magnitude of -1 would be greater than that of -1.73

sir tan 45 =1 then why hav u taken it as root 2 and secondly if we have to consider only magnitude in slope then too magnitude of -1 would be greater than that of -1.73