1. The problem statement, all variables and given/known data Show that this equation is dimensionally correct. y = (2m)cos(kx), where k = 2m^-1 2. Relevant equations None that I know of. 3. The attempt at a solution I don't know why this is correct. I have looked through the chapter and all of the dimensional analysis examples(there are only three) list what the variables represent. The only information given is what I have typed, so I am just assuming that m represents meters. Are trig. functions dimensionless?