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1) sin x/2 = √3/2x/2 = π/3 + πn, n∈Zx = (2π)/3 + 2πn, n∈Z2) cos 5x = 1/24x = +- π/3 + 2πn, n∈Zx = +- π/12 + (πn)/2, n∈Z3) tg (3x)/4 = 1(3x)/4 = π/4 + πn, n∈Z3x = π + 4πn, n∈Zx = π/3 + (4πn)/3, n∈Z4) ctg 4x  = 04x = π/2 + πn, n∈Zx = π/8 + (πn)/4, n∈Z5) sin x = √2/2x = π/4 + πn, n∈Z6) cos x = 1/2x = +- π/3 + 2πn, n∈Z7) tg x = 1x = π/4 + πn, n∈Z8) ctg x = √3x = π/6 + πn, n∈Z9) tg x/2 = 3/2x/2 = arctg 3/2 + πn, n∈Zx = arctg 3 + 2πn, n∈Z10) sin ((3x)/2 + π/3) + 1 = 0sin ((3x)/2 + π/3) = -1((3x)/2 + π/3) = - π/2 + 2πn, n∈Z(3x)/2 = - π/2 - π/3 +2πn, n∈Z(3x)/2 = - (5π)/6 + 2πn, n∈Zx = - (5π)/9 + (4πn)/3, n∈Z11) 2cos(2x-π/4)=1cos(2x-π/4)=1/22x-π/4=+-π/3+2πn, n∈Z2x=+-π/12+2πn, n∈Zx=+-+-π/24+πn, n∈Z