dy/dx is the derivative of y with respect to x.

That is y=f(x). y=f(x)

If you say find the derivative of y, it is likely that y=f(z) or y=f(k) or y=f(x) y, being a function of z or k etc. depending on the question.

Pain is a physical feeling, like when you break a bone, or get a toothache, or when you go into labor to have a child, even your stomach, when you get hunger pains. This is all connected to your nerves, which act as sensors and send messages to your brain, and you have the physical reaction. Suffering is similar, but not the same thing. Say you have a toothache, that’s the pain part of it, but the suffering would come when you can’t go to the dentist to have it fixed, and you have to suffer with the pain, and possibly the infection. There are other levels of suffering as well, like when you lose someone you loved very much, the pain of that loss causes your heart to endure this, and it can take a long time to heal, or never heal at all. Suffering happens over a long period of time, or what can seem to be an eternity. Hope this helps, good luck.

dy/dx clearly tells you to find the derivative of y with respect to x, whereas find the derivative of y is incomplete as it is not given with respect to what? but generally if it is not specified, it is assumed that you are expected to find the derivative with respect to x. hope it helps