Does someone know what I'm doing wrong? I'm struggling with this for a while now and I don't see what I do wrong!
$$1+1=$$
$$1+\sqrt{1}=$$
$$1+\sqrt{-1*-1}=$$
$$1+\sqrt{-1}*\sqrt{-1}=$$
$$1+i*i=$$
$$1-1=0$$
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