Question

Liczba jest równa:

a) -1/2 b) 1/2 c) 1 d) 2

Answer 1

Log₂ (√2/2)=x  ⇔ 2^x=√2/2

2^x=2¹/²⁻¹
2^x = 2⁻¹/²
x=-1/2
Odp. A

Answer 2

V - pierwiastek
log2 (sin 45°) = log2 ((V2)/2) = log2 [2^(1/2) / 2^1] = log2 [2^(-1/2)] = -1/2