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|4sinx+1|<3
-3<4sinx+1<3
-4<4sinx<2 /:4
-1<sinx<1/2
sinx=1/2 dla x=π/6 lub x=5/6π
sinx=-1 dla x=3/2π
odp.
x∈(-π/2 +2kπ ; π/6 +2kπ) u (5/6π +2kπ ; 3/2π +2kπ)