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sinx-2sinxcosx>0
sinx(1-2cosx)>0
(sinx>0 i cosx<1/2) lub (sinx<0 i cosx>1/2)
x∈(0,π) i x∈(π/3,5/3π) lub (x∈(π,2π) i x∈(0,π/3) U (5/3π,2π)
x∈(π/3,π) lub x∈(5/3π,2π)
x∈(π/3,π)U(5/3π,2π)