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10 sin^2(x/3)-12 sin(x/3)cos(/3)-11 cos^2(x/3)=1
cos(3π/2+x)-5cosx=0
√3ctg(π/3-4x)=3
10 sin^2(x/3)-12 sin(x/3)cos(/3)-11 cos^2(x/3)=1
cos(3π/2+x)-5cosx=0
√3ctg(π/3-4x)=3
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