Division by zero, can't treat i as if it was a real number and why would you take the derivative of both sides ?
No, stop this stupid debate.
viva la manana fantastica
Old. Also, wrong.
There are intrinsic errors in these proofs. The first divides by zero, the second incorrectly states that i = -i (1/i = -i), and the third misuses derivatives (x^2 = C, a constant, implies that 2x = 0).
El primero es un poco tonto, pero cuela. Los otros dos todav? hay que ojearlos con m疽 cuidado.