### Simple trigonometric equation

I am a beginner and I am reading the page *Basic Algebra and Calculus* of the Tutorial where there is the following example

```
theta = var('theta')
solve(cos(theta)==sin(theta), theta)
```

and there is no solution, but a human being and other systems, like Mathematica, are able to solve this simple equation.
So I suppose there is a way to solve it with Sage. Can you show me how?