From equation (8) to equation (9) fro the link attached below which the equation is written into a complex form. But why can it be written in that form even though the equation do not have an imaginary part isin(omega*t-kz+phi)?(adsbygoogle = window.adsbygoogle || []).push({});

http://scienceworld.wolfram.com/physics/WaveEquation.html

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# Wave equation

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