How do you beat ANGRA MAINYU......I lost to him almost 40timeszz..and ..

First make sure that all have all cahracters accessories with auto-protect and auto-reflect, it would be best to have have two of your characters as dark knights and the other as a alchemist. Make the two dark knights cast darkness every turn and have the alchemist mix a potion and a hi-potion to make a mega potion even if your party seems to be doing alright, your party must stay healthy just in case he uses perdition's flame, to prevent this attack keep making the dark knight's use darkness to keep his sidekicks KO'ed so he cannot perform this attack, no matter what always have the alchemist mix up mega potions and absolutly no matter what make sure your dark knights keep using darkness because he revives his sidekicks with full-life.

All you need is a healer and two Dark Knights.

Your healer can be the White Mage, Alchemist or Gun Mage
White Mage: just heal and cast ESUNA because the two extensions cast something that inflicts a lot of status ailments.

Although if silence just happens to be one of them, I don't think that a White Mage will do you much good, unless ofcourse you give her a Ribbon.
Alchemist: MIX a Potion and a Hi-Potion to use a Mega-Potion. Use Remedies and Phoenix Down if you need to. What's great about this is the fact that this job doesn't use MP, isn't effected by silence can attack if everyone is fine.

Gun Mage: Not too much of a healer. If you've been collecting BLUE BULLET skills, the WHITE WIND and MIGHTY GUARD should do you good.

However, I doubt that you have MIGHTY GUARD because I haven't got it yet. I only read it in other game guides.

It's supposed to be obtained from Garik. The Gun Mage can also attack if everyone's fine.

Have the two Dark Knights cast DARKNESS over and over.