sin x = a
a) x = (-1)^n * π/3 + πn, n ∈ Z
б) x = (-1)^n * π/4 + πn, n ∈ Z
в) x/3 = (-1)^(n+1) * π/6 + πn, n ∈ Z
    x = (-1)^(n+1) * π/2 + 3πn, n ∈ Z
г) x = πn/3, n ∈ Z
д) x = -π/2 + π/6 + 2πn, n ∈ Z
    x = -π/3 + 2πn, n ∈ Z

cos x = a
a) x = (+/-) π/4 + 2πn, n ∈ Z
б) x/2 = (+/-) π/3 + 2πn, n ∈ Z
    x = (+/-) 2π/3 + 4πn, n ∈ Z
в) x = (+/-) arccos (-1/2) + 2πn, n ∈ Z
    x = (+/-) (π - π/3) + 2πn, n ∈ Z
    x = (+/-) 2π/3 + 2πn, n ∈ Z
г) x = 2πn/3, n ∈ Z
д) x = π/2 - π/4 + πn, n ∈ Z
    x = π/4 + πn, n ∈ Z

tg x = a
a) x = π/6 + πn, n ∈ Z
б) tg x = 0
    x = arctg 0 + πn, n ∈ Z
    x = πn, n ∈ Z
в) 2x = arctg (-1) + πn, n ∈ Z
    2x = -π/4 + πn, n ∈ Z
    x = -π/8 + πn/2, n ∈ Z
г) x/2 = arctg √3 + πn, n ∈ Z
    x/2 = π/3 + πn, n ∈ Z
    x = 2π/3 + 2πn, n ∈ Z
д) x - π/4 = arctg 1 + πn, n ∈ Z
    x - π/4 = π/4 + πn, n ∈ Z
    x = π/4 + π/4 + πn, n ∈ Z
    x = π/2 + πn, n ∈ Z