1 | initial version |

First, make sure that you variable "x" is defined to be a symbolic variable:

```
sage: var('x')
```

then you can use the command integrate:

```
sage: integrate(sin(x)*tan(x), x)
-1/2*log(sin(x) - 1) + 1/2*log(sin(x) + 1) - sin(x)
```

2 | No.2 Revision |

First, make sure that you variable "x" is defined to be a symbolic variable:

```
sage: var('x')
```

then you can use the ~~command integrate:~~integrate command:

```
sage: integrate(sin(x)*tan(x), x)
-1/2*log(sin(x) - 1) + 1/2*log(sin(x) + 1) - sin(x)
```

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