Question

1 - tan square(15°) / 1+tan square(15°)​

Answer 1

1-tan^2 A/1+tan^2 A = Cos 2A

here A=15

answer is : cos 30= root3/2

Answer 2

Answer:

$\frac{1 - {tan}^{2} 15}{ {sec}^{2} 15} \\ \frac{ {cos}^{2}15 - {sin}^{2}15 \times {cos}^{2} 15 }{ {cos}^{2} 15} \\ {cos}^{2} 15 - {sin}^{2} 15 \\ hope \: it \: will \: help \: you$