1 | initial version |

Hi,

it is possible, just try

```
var('x')
((cos(x)-sin(x))^2).trig_simplify()
```

which will result in

```
-2*cos(x)*sin(x) + 1
```

2 | No.2 Revision |

Hi,

it is possible, just try

```
var('x')
((cos(x)-sin(x))^2).trig_simplify()
```

which will result in

```
-2*cos(x)*sin(x) + 1
```

since sin(x)^2+cos(x)^2=1 (I think you mean this formula with the trigonometric identity).

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