The movie is a romantic musical with a slim plot. It included the popular dance team of Fred Astaire and Ginger Rogers, and also starred Alice Brady and Edward Everett Horton.
The movie won the Academy Award for Best Song for "The Continental".
(Obviously, the present-day meaning of gay was not in general use in 1934!)
... (Z) of both waves all coincide. The phase difference of the waves is thus zero, or, the waves are said to be in-phase.
If the two in-phase waves A and B are added ...
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