What type of wave is described by this equation

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The equation x = (0.15 mm) cos (210x-120t) describes a wave, but its classification is debated. Some participants suggest it may represent a longitudinal wave due to the variable x being used, while others argue that the equation does not conform to standard wave forms. Concerns are raised about the use of the same variable for both displacement and position, which complicates its interpretation. There is uncertainty about whether the wave is transverse or longitudinal, as the equation does not fit typical wave equations. Overall, the discussion highlights confusion regarding the wave's classification based on its mathematical representation.
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Homework Statement


x = (0.15 mm) cos (210x-120t)
what type of wave is described by this equation?

Longitudinal, transverse, angular frequency or both transverse and longitudinal

Homework Equations


NA

The Attempt at a Solution


Theres really no calculation. I thinking its longitudinal because it is given as "x=". if it were transverse I am thinking it would be given as "y="
At the same time I am not even sure if I am right
 
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Some BS equation you got there.
 
Taking the equation literally, with x on both sides, I don't recognise it as any of the usual wave equations. E.g. For a longitudinal wave, the x on the right would be the mean position of an oscillating segment, while the x on its left would be its displacement at time t; i.e. they should be two different variables.
 
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