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Main Question or Discussion Point
I am rather new to the whole idea of complex conjugates and especially operators.
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.
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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