Where does the plane wave solution ((adsbygoogle = window.adsbygoogle || []).push({}); cos (ax-bt) and e 2pi(ax-bt)) come from?

I know that any solution of the form f(ax-bt) is a solution to the general wave equation but why are the two particular ones above used for describing photons/ particles in quantum mechanics?

Anyone here know?

Ive got an exam in quantum mechanics in about a month and dont know anything yet!

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# What is a plane wave?

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