```
A+B=225;; A+B=180+45 ;; -45=180-(A+B) ;;
```

TAKING TAN BOTH SIDES ;;; TAN(-45)=TAN(180-(A+B));;; -1=-TAN(A+B);;

```
TAN(A+B)=1 ;;;
TAN(A) + TAN(B) = 1- TAN(A)TAN(B) ;;;
TAN(A)+TAN(B)+TAN(A)TAN(B) = 1 ;;
Question was to find {1+TAN(A)}{1+TAN(B)} === 1+ TAN(A) +TAN(B) + TAN(A)TAN(B) == 1+ 1 == 2
```