How to find a potential of a differential form?

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I need some help in understanding the meaning of this exercise:

Determine a potential of the following differential form

$$\omega = (3x^2y + z) dx + (x^3 + 2yz) dy + (y^2 + x) dz$$

I don't understand exactly the command.

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You need to determine a function $f : \mathbb{R}^3 \to \mathbb{R}$ such that $\omega = df$