Question

Use add or sub formula to write as trig fun tho on

Answer 1

`(tan(43)-tan(18))/(1+tan(43)tan(18))`

The formula to write this function is going to be:

`tan(a-b)=(tan(a)-tan(b))/(1+tan(a)*tan(b))`

Substituing:

`(tan(43)-tan(18))/(1+tan(43)tan(18))=tan(43-18)`

In this case a= 43 and b=18:

`tan(43-18)=tan(25)=0.466\approx0.5`

The answer is: tan(25).