Question

1) sinx < 1/2
2) cos2x > 0
3) 3 – 4cos2x > 0
4) cosx > – 1/2
5) sin3x < 0
6) tgх>
7) sinx < cosx
8) 1 – 4sin2 x < 0

Answer 1

1. sinx = 1/2,

x = (-1)ⁿ · π/6 + πn, n ∈ Z

Ответ: (-1)ⁿ · π/6 + πn, n ∈ Z.