The displacement of a wave traveling in the negative y-direction is D(y, t) = (5.2 cm) sin(5.5y

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The displacement of a wave traveling in the negative y-direction is D(y, t) = (5.2 cm) sin(5.5y + 72t), where y is in m and t is in s.
What are the 

(a) Frequency,

(b) Wavelength,

(c) Speed of this wave?

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