Two waves travel simultaneously through the same medium

The first wave is described by y1(x,t) = Acos(kx-?t) and the second wave by y2(x,t) = A cos(kx-?t + ?). If the amplitude of the resulting superposition is A/2, what are the possible values of ??
A)

?/6, -?/6

B)

?/3, -?/3

C)

?/8, -?/8

D)

60°, -60°

E)

?/4, -?/4


B

Physics & Space Science

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