Wow, thanks for the analysis Harry !
In physics parlance, what this says is......
A sine function has a period of 2pi radians (=360 degrees--meaning, after every 2pi radians, its function values repeat themselves).
Now the Amplitude is a number which is a multiplier of the values--a plain sine curve has maximum value of One,
minimum of negative One (at the value pi/2, it attains One; at 3pi/2 it attains negative One--and the Amplitude would
be a multiplier of that.) So, the new function multiplies all the y-values by Negative One, which flips the curve around the
x-axis.....(y=A sin x becomes y=(-1)A sin x , in the equations. Pitch corresponds to frequency, basically how many times this curve
squeezes in- between 2pi radians. Or, y=(Amplitude) times sin(kx plus omega times t), where omega times t =2pi times frequency.
And, the k is thrown in to make it all dimensionally correct,that is k has dimensions of inverse wavelength !).
For those curves to be "out of phase", something has to be altered.
And, for the two curves to be "flipped", y-values changed to their opposites-- on top of that, means more alteration !
Well, to make a long story short:
Something is amiss between the two--single 45 and LP--- versions !
And, now, there really is a kind of hush....as I put everyone to sleep....
Not to mention no references were consulted--so, those equations had better be correct !
As Physicist Richard Feynman used to say, always double-check your instructor !