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sinx ∈(0,1)
sin x >0 ^ sinx<1
m²-4m+4>0 ^ m²-4m+3<0
Δ =0 ^ Δ=16-12=4
m=-b/2a ^ m₁=4-2 /2= 1
m=2 ^ m₂=4+2 /2=3
m ∈R\{0} ^ m∈(1,3)
1^2
m∈(1,3)