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**realintegerz** The height of a piston in a cylinder can be modeled by a sine or cosine function. A piston is at its lowest point in a cylinder, 8 cm from the bottom at t = 3.2 seconds. The piston is at its highest at 39 cm, at t=3.6 seconds

I'm trying to find an equation for this function but I can't seem to get it right

So far I got 15.5 cos ( (something)x - 3.6) +23.5

I've switched things around and I'm forgetting how to shift the function's period, I know the cosine function has a period of pi, but I want it to be 0.4, since its high and low are between 3.6 and 3.2 seconds