Question

1-tan215°÷
1+tan215°​

Answer 1

Step-by-step explanation:

$\frac{(1 - tan²15°)}{(1 + tan²15°)}$

$We \: know \: that-$

$\frac{(1 - tan²O)}{(1 + tan²O)}=Cos(2O)$

$Here:- O=15°$

$Cos(2*15°)$

$Cos(30°)$

$=>\frac{√3}{2}$