it works on the principle of seven segment display.
according to the number the respective lines ,among 7 ,are displayed.
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Yes there is you shouldn't use it though on Calculator Soup.
Buy a good calculator.
10^1000
On your calculator, there should be a Tan button. Hit that, then type in 81. Voila! Tan81 = 6.313751515 (As far as my calculator shows.)
actually I'm not sure that you can do it on a calculator or not. I think the only way is deviding untill the half of the number. But I recently have found a great site that works as calculator and it can help you to understand a number is prime or not. Go to prime-calculator dot com.