Liczba sin pi/8 * cos pi/8 jest rowna? A: 1/2 B. (pierw 2)/2 C. (pierw 2)/4 D.(pierw 2)/8

[latex]sin(frac{pi}{8})cdotcos(frac{pi}{8})=frac{1}{2}(2sin(frac{pi}{8})cdotcos(frac{pi}{8}))= frac{1}{2}sin(2cdotfrac{pi}{8})=\ =frac{1}{2}sin(frac{pi}{4})=frac{1}{2}cdotfrac{sqrt{2}}{2}=frac{sqrt{2}}{4}[/latex]