interesting qun .. generally asked in interviews

Qun: We are given four zeros and using any mathematical operation we have to make 24.
Well, those who really want to know the answer csn scroll down and others who want to give it a try, better turn on to the next post..
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So I have 3-4 answers to it.
1) (0!+0!+0!+0!)! (0!=1)
2) (Cos0 + Cos0 + Cos0 + Cos0)!
3) (Sin0)! adding four times as in first.
4) (tan0)! same as above.