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niech sinx=t, t∈<-1,1>
2t^3+t^2-5t+2=0
(t-1)(2t^2+3t-2)=0
t=1 lub 2t^2+3t-2=0
Δ=25, t=-2 lub t=1/2
sinx=1 lub sinx=1/2
x= π/2+2kπ lub x=π/6+2kπ lub x=5/6π+2kπ, k∈C