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2sinx<2/:2 ∧ 2sinx>0/:2
sinx<1 ∧ sinx>0
x∈R \ {(π/2)+2kπ} i k∈C ∧ x∈(2kπ ; π+2kπ)
x∈(2kπ;(π/2)+2kπ) u ((π/2)+2kπ ;π+2kπ )
−1 < 2 sin x − 1 < 1 / +1
0 < 2 sin x < 2 / :2
0 < sin x < 1
x ∈ ( 2kπ , (2k+1)π ) ∖ { 2kπ + π2 } ∧ k∈C