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20 cos2x=√3/2 2x=+-π/6+2πk x=+-π/12+πk,k∈z 21 3sin²x+cos²x-2=0 3(1-cos2x)/2+(1+cos2x)/2-2=0 3-3cos2x+1+cos2x-4=0 -2cos2x=0 2x=π/2+πk x=π/4+πk/2,k∈z