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[itex]\left|(cos\theta-1)+i.sin\theta\right|[/itex]

= [itex]\sqrt{}(cos\theta-1)^2+sin^2\theta[/itex]

Now my question is, how did the 'i' got eliminated from the second step? Now, i equals [itex]\sqrt{}-1[/itex], so when squared, there should be a minus sign in the second step. Can anyone help me clearing my basics?