Question

Use a half-angle identity to find the exact value of tan 15°
a. √ 7+4 sqrt 2
b. √ 7+4 sqrt 3
c. √ 7-4 sqrt 2
d.√ 7-4 sqrt 3
oobleck
tan 15° = (1-cos30°)/sin30° = sin30°/(1+cos30°)
use either to get what you want