I am rather new to the whole idea of complex conjugates and especially operators.(adsbygoogle = window.adsbygoogle || []).push({});

I was trying to understand the solution to a problem I was doing, but the math is confusing me rather than the physics. In the last row of calculations, why does the sin change to a cos, and the d/dx change to what it is. I recognize that n(pi)/L is the first derivative of the inside function for the trig functions, but don't understand how it got there.

Thank you for any help and sorry in advance if I posted this in the wrong section, I'm not positive what section this would fall under.

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# Complex Conjugates with sin and cos

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