https://www.desmos.com/calculator/xgw33pnx1p
When moving the slider of variable "m", we can see that the red curve is being bend, and you can clearly see that the lowest part of that red curve follow sine wave (green line)
Instead follow sine wave, how to make that lowest part follow blue line (straight line) instead sine wave while changing "m" variable and still keep original shape? If you know how, please explain as simple as possible how did it work and provide the polar function :(.
I know that this question may asked somewhere, but with limit English, I don't know how to search this type of problem and the name of the curve, and the question may unclear to some...