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Introduction of a phase difference of 180°. *Note:* Phase inversion may occur with a random or periodic, symmetrical or non-symmetrical waveform, although it is usually produced by the inversion of a symmetrical periodic signal, resulting in a change in sign. A symmetrical periodic signal represented by *f* (*t* ) = *A* e^{jt} , after phase inversion, becomes *f* _{1}(*t* ) = Ae^{j(t +)}, where *t* is time, *A* is the magnitude of the vector, is angular frequency ( = 2*f* ), where *f* is the frequency and 3.1416 and e 2.7183. The algebraic sum of *f* (*t* ) and *f* _{1}(*t* ) will always be zero.