Transverse wave equation period

by james brug
Tags: equation, period, transverse, wave
 P: 34 A transverse wave on a rope is given by $$y(x, t)= (0.750\; {\rm cm})\, \cos ( \, \pi [(0.400\;{\rm cm}^{ - 1})x+(250\; {\rm s}^{ - 1})t])$$ Find the period. This should be simple, but I keep getting the wrong answer in Mastering Physics. I can't find any explanation in my book, and it's really irritating me.
 HW Helper P: 4,439 Rewrite the equation in a standard form. y(x,t) = Acos[2*pi(x/lambda + t/T)] Compare this with the given equation and find the period.

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