[tex]\frac{tan(43)-tan(18)}{1+tan(43)tan(18)}[/tex]
The formula to write this function is going to be:
[tex]tan(a-b)=\frac{tan(a)-tan(b)}{1+tan(a)*tan(b)}[/tex]
Substituing:
[tex]\frac{tan(43)-tan(18)}{1+tan(43)tan(18)}=tan(43-18)[/tex]
In this case a= 43 and b=18:
[tex]tan(43-18)=tan(25)=0.466\approx0.5[/tex]
The answer is: tan(25).
