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\sqrt{841}-\sqrt{400+441}
Add 441 and 400 to get 841.
29-\sqrt{400+441}
Calculate the square root of 841 and get 29.
29-\sqrt{841}
Add 400 and 441 to get 841.
29-29
Calculate the square root of 841 and get 29.
0
Subtract 29 from 29 to get 0.
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