а) sin(x/3-π/4) = -√3/2
x/3-π/4 = (-1)^(k+1)π/3 +πk , n∈Z
x=3π/4+(-1)^(k+1)π +3πk , n∈Z
б) cos(2x+π/3)=1/2
2x+π/3 =(+/-)π/3+2πk
2x=2πk x₁= πk
2x = - 2π/3+2πk x₂ = - π/3+πk , k ∈Z
в) tq(x-π/3)= -1/√3
x-π/3= - π/6+πk
x = π/6 + πk
г) cosx/5 = -7/4 не имеет решения т.к. 7/4 < -1
д) sin(3x-π/3)=0
3x-π/3=πk
x=π/9 +π/3*k
t)