1) 2x = 2
x =1
2)Sin2x = 1
2x = π/2 + πk , k∈Z
x = π/4 + πk/2, k ∈Z
3) Cosx/3 = √2/2
x/3 = +-arcCos√2/2 + 2πk , k ∈ Z
x/3 = +-π/4 + 2πk , k ∈Z
x = +-3π/4 + 6πk , k ∈Z
4) 2Cosx + 2SinxCosx = 0
Cosx(2+ 2Sinx) = 0
Cosx = 0 или 2 +2Sinx = 0
x = π/2 + πk , k ∈Z Sinx = -1
x = -π/2 + 2πn , n ∈Z
5) 7ˣ⁻¹(7 -1) = 6
7ˣ⁻¹ = 1= 7⁰
x -1 = 0
x = 1