Question

Evaluate cos^2 (n/12)

Answer 1

[(2 + √3)/4] = 0.9330127

Explanation:

We know that

cos (pi/12) ^ 2 =

cos (pi/12)* cos (pi/12) =

[(√6 + √2)/4]*[(√6 + √2)/4] =

(0.9659)*(0.9659) = 0.9330127

[(2 + √3)/4] = 0.9330127