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Which of the following choices best describes the superposition of Wave A and Wave B?

$${ y }_{ A }(0,t) = 6\cos(\pi t)$$$${ y }_{ B }(0,t) = 6\cos(\pi t+\pi)$$

$y(0,t)=12\cos(\pi t)$

$y(0,t)=12\cos(0t)$

$ y(0,t)=0$

$y(0,t)=6\cos(\pi t)$