Math Is Fun Forum

I heard about this puzzle the other day.

Take three 4's, that's 4, 4 and 4

Now perform any mathematical computation that does not introduce any new numbers and come up 55 as the answer.

You can use any mathematical expression/symbol, ie, sin 4, 4!, 4^4, etc... but only use the three 4's in that combination to get your answer.

Good luck!