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cos(1/2x - π/6) = 1/2
1/2x - π/6 = π/3 + 2kπ
1/2x = π/3 + π/6 + 2kπ
1/2x = π/2 + 2kπ /×2
x = π + 4kπ
Zad 8.81 d)
ctg(1/3x + π/3) = √3
1/3x + π/3 = π/6 + kπ
1/3x = π/6 - π/3 + kπ
1/3x = -π/6 + kπ /×3
x = -π/2 + 3kπ
Zad 8.82 b)
2sin3x = √2 /÷2
sin3x = √2/2
3x = π/4 + 2kπ /÷3
x = π/12 + 2kπ/3