? logarc;

Calculate

logarc (x);

Calculate

? logarc;

Calculate

logarc (x);

Calculate

### logarc

Run Example
```(%i1)rt:tan(atan(1/2)+atan(1/3))=1;
1         1
(%o1)                     tan(atan(-) + atan(-)) = 1
2         3
(%i2) trigsimp(lhs(rt));
1         1
sin(atan(-) + atan(-))
2         3
(%o2)                       ----------------------
1         1
cos(atan(-) + atan(-))
2         3
(%i3)  logarc(lhs(rt));
%i                %i             %i                %i
%i (log(-- + 1) - log(1 - --))   %i (log(-- + 1) - log(1 - --))
2                 2              3                 3
(%o3) - tan(------------------------------ + ------------------------------)
2                                2
(%i4) ratsimp(%);
(%o4)             ```
Run Example
```logarc (x);
(%o1)                                  x
(%i2) ```
Run Example
```mf:1=tan(atan(1/2)+atan(1/3));
1         1
(%o1)                     1 = tan(atan(-) + atan(-))
2         3
(%i2) trigsimp(rhs(mf));
1         1
sin(atan(-) + atan(-))
2         3
(%o2)                       ----------------------
1         1
cos(atan(-) + atan(-))
2         3
(%i3) logarc(rhs(mf));
%i                %i             %i                %i
%i (log(-- + 1) - log(1 - --))   %i (log(-- + 1) - log(1 - --))
2                 2              3                 3
(%o3) - tan(------------------------------ + ------------------------------)
2                                2
(%i4) logcontract(exp);
(%o4)                                 exp
(%i5) ratsimp(%);
(%o5)              rectform(%);
```

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