Certainly! Here's a function that will create a cool and wavy graph in Desmos:

```
y = 3*sin(3x) + 2*sin(5x)
```

This function combines two sine waves with different frequencies to create a visually interesting and wavy graph. You can adjust the coefficients of the sine functions to modify the shape and amplitude of the waves. Have fun exploring and tweaking the function to create your desired cool and wavy graph!
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