fa33ala: in general is the intensive form, in which the subject X, do an action toward the object Y
--------: kassara mohammadu az-zojaaja= mohammed broke the glass
--------: here the performer is mohammed, and the receiver is the glass
tafa33ala: here the the Subject is the performer and the receiver of the action, or in a simple term it is the medio-passive
-----------: takassar az zujaaju= The glass broke
----------: here the glass is the thing that performed and received the end the result of the action of the breaking
while the passive of fa33ala
fu33ila: kussira az zujaaju= the glass was broken
--------:here the glass received the action, but the performer is missing and you want to know to know who performed the action
so in simple terms,
1_ fa33ala: is the intensive, where there is a Subject and an Object
2_fu33ila: is the passive; you use it, when the Subject is unknown and you is important to you
3_tafa33ala: is used for the medio-passive or when the Subject is not important to you