1 | initial version |

Using the keyword argument `algorithm='sympy'`

leads to more success:

```
sage: solve(cos(theta)==sin(theta), theta, algorithm='sympy')
[ImageSet(Lambda(_n, 2*_n*pi + 5*pi/4), Integers),
ImageSet(Lambda(_n, 2*_n*pi + pi/4), Integers)]
```

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