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A wave represented by the equation y=acos(kx-ωt) is superposed with another wave to form a stationary wave such that point x=0 is a node. The equation for the other wave is?

a) acos(kx-ωt)

b) -acos(kx-ωt)

c) -acos(kx+ωt)

d) -asin(kx-ωt)

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