1 | initial version |

I propose :

```
var('a,b,x,x1,x2,x4')
eq=e^(-a*log(x1)/(a+b)+a*log(x1)/(a+b)+a*log(x2)/(a+b)-a*log(x4)/(a+b))
show(eq.simplify_log())
```

2 | No.2 Revision |

I propose :

```
var('a,b,x,x1,x2,x4')
eq=e^(-a*log(x1)/(a+b)+a*log(x1)/(a+b)+a*log(x2)/(a+b)-a*log(x4)/(a+b))
show(eq.simplify_log())
```

SageMath doc on symbolic expression

but I admit that me too , I am a bit lost in all these different simplifying functions!

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