The calculated x^2 result is wrong.

Run the calculator demo, input, say 54. Then:
1/x ==> 0.0185185185185. Then:
x^2 ==> 0.0003429355281
x^2 ==> 1.1760477643322

This is obviously wrong. When x < 1, and you do x^2, the result will be smaller, until it reaches 0. This could be reproduced with other number that is smaller than 1.