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

$${ y }_{ A }(0,t) = 3\cos(2t)$$$${ y }_{ B }(0,t) = 4\cos(2t)$$

$y(0,t)=7\cos(4t)$

$y(0,t)=7\cos(2t)$

$y(0,t)=\cos(4t)$

$y(0,t)=12\cos(2t)$