Question

1-tan^215/1+tan^215=​

Answer 1

Answer:

give it by image plzz it is difficult to understamd

Answer 2

1 - tan^2Φ / 1+ tan^2Φ = cos2Φ

here Φ = 15° then 2Φ = 30°

cos2Φ = cos30° = √3/2

hope it helped you