calculeaza sin pi /12

Răspuns :

sin π/12 = sin (π/3 - π/4)
= sin π/3 cos π/4 - sin π/4 cos π/3
= √3/2 • √2/2 - √2/2 • 1/2
= √6/4 - √2/4
= (√6 - √2)/4
= √2(√3-1)/4