# Using "Z with subscript" parameters in `solve` solutions

Trying to solve some equation and faced with `z`

with subscript notation. Tried to google it but failed.

```
sage: t = SR.var('t')
sage: eq = cos(t) + 6 - 5 - 1.5 * sin(t) == 0
sage: sol = solve([eq], t, to_poly_solve=True)
sage: sol
[t == pi + 2*pi*z1798, t == 2*pi*z1816 + arctan(12/5)]
```

Guess `z1798`

and `z1816`

mean "any integer".
But what do numbers after z mean?

Can I set an integer manually and calculate the corresponding solution?

Welcome to Ask Sage! Thank you for your question.

Congratulations for guessing the meaning of the $z_n$ in the solutions returned by

`solve`

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