1) 2sin(pi/12)cos(pi/12) = 2 sin(15°) cos(15°) = 2 0.2588 0.9659 ≈ 0.5000
2) (cos(pi/8) - sin(pi/8))(cos(pi/8) + sin(pi/8)) = (cos(22.5°) - sin(22.5°)) * (cos(22.5°) + sin(22.5°))
= (0.9239 - 0.3827) (0.9239 + 0.3827)= 0.5412 1.3066≈ 0.7071
1) 2sin(pi/12)cos(pi/12) = 2 sin(15°) cos(15°) = 2 0.2588 0.9659 ≈ 0.5000
2) (cos(pi/8) - sin(pi/8))(cos(pi/8) + sin(pi/8)) = (cos(22.5°) - sin(22.5°)) * (cos(22.5°) + sin(22.5°))
= (0.9239 - 0.3827) (0.9239 + 0.3827)
= 0.5412 1.3066
≈ 0.7071