Spot the math error (Mathematical fallacy).
Yes, you can cheat and look at the solution here.
easy shit (-3²) = 3² so the 3-x = pi - x line is just 1 of the 4 possibilities
Yeah… What he said…
Yesterday I posted this in Science is Beauty. Any Science student should be able to find the fault before blinking three times. However I am seeing that many people make a slight mistake by giving the solution. Although it is correct that the error comes from considering only the positive root as valid solution, it is not correct that there are four solutions (positive / negative on both sides of the equation), as two of them are identical and produce the same solution. So there are only two solutions, the positive root (erroneous) that leads to absurd pi = 3, and the negative root who leads directly to the original identity. For your info.