Consider the following transfer functions: $$\eqalign{ & 1.\,\frac{1}{{j\omega + 1}} \cr & 2.\,\frac{1}{{{{\left( {j\omega + 1} \right)}^2}}} \cr & 3.\,\frac{1}{{\left( {j\omega + 1} \right)\left( {j\omega + 2} \right)}} \cr} $$ The transfer functions which have a non linear phase are:

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