Question

How can you use the double angle or half angle formula to find the cos(π/12)?

Answer 1

Answer:

i think you can use this formula

$\cos( \frac{\pi}{12 } ) = \cos( \frac{\pi}{4} - \frac{\pi}{6} ) = - \cos( \frac{\pi}{6} ) = \frac{ \sqrt{3} }{2}$