# hi , what wrong with this code

**when i enter**

```
@interact
def _(a=(1,4,1), b=(0,10,1)):
show(plot(sin(a*x+b), (x,0,2*pi/a),ticks=pi/2*a,tick_formatter='latex',gridlines=True))
```

sage notebook 7.3 fedora 25 gives the error

```
ValueError: Expand the range of the independent variable to allow two
multiples of your tick locator (option `ticks`).
```

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