I have found a proof that \(-1=1\). Or have I? If you think one of these steps is wrong, input your answer as the step number.

Step 1: \(-1\)

Step 2: \(={ i }^{ 2 }\)

Step 3: \(=i\times i\)

Step 4: \(=\sqrt { -1 } \times \sqrt { -1 } \)

Step 5: \(=\sqrt { -1\times -1 } \)

Step 6: \(=\sqrt { 1 } \)

Step 7: \(=1\)

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