1 | initial version |

Since both `sqrt(3)*x-y`

and `-sqrt(3)*x+sqrt(3)-y`

must be positive to define your region, multiply the two together:

```
var('x y')
contour_plot((x^2) * cos(x*y), (x,0,1), (y,0,sqrt(3)/2),
region=(sqrt(3)*x-y)*( -sqrt(3)*x+sqrt(3)-y), fill=True, contours=30)
```

Here's a live example.

2 | No.2 Revision |

Since both `sqrt(3)*x-y`

and `-sqrt(3)*x+sqrt(3)-y`

must be positive to define your region, multiply the two together:

```
var('x y')
contour_plot((x^2) * cos(x*y), (x,0,1), (y,0,sqrt(3)/2),
```~~region=(sqrt(3)*x-y)*( -sqrt(3)*x+sqrt(3)-y), ~~region=(sqrt(3)*x-y)*(-sqrt(3)*x+sqrt(3)-y), fill=True, contours=30)

Here's a live example.

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