Răspuns:
Explicație pas cu pas:
f(x)=2x/(1+x²)
Pti condiria ca
l2x/(1+x²)l≤1
-1≤2x/(1+x²)≤1=>
A){-1≤2x/(1+x²)
-1-x²≤2x
0≤1+x²+2x)0≤(x+1)²adevarat∀ x∈R
B)2x/(1+x²)≤1
2x≤1+x²
0≤1+x²-2x
0≤(1-x)²=>
inegalitatea adevarara ∀X ∈R=>
-1≤f(x)≤1
functia marginita
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Răspuns:
Explicație pas cu pas:
f(x)=2x/(1+x²)
Pti condiria ca
l2x/(1+x²)l≤1
-1≤2x/(1+x²)≤1=>
A){-1≤2x/(1+x²)
-1-x²≤2x
0≤1+x²+2x
)0≤(x+1)²adevarat∀ x∈R
B)2x/(1+x²)≤1
2x≤1+x²
0≤1+x²-2x
0≤(1-x)²=>
inegalitatea adevarara ∀X ∈R=>
-1≤f(x)≤1
functia marginita