0 }} \right.\\\\\left \{ {{x^{2}-1\leq0} \atop {x^{2} >0}} \right.\\\\\left \{ {{(x-1)(x+1)} \leq0 \atop {x^{2}>0 }} \right." alt="\left \{ {{x^{2}\leq1} \atop {x^{2}>0 }} \right.\\\\\left \{ {{x^{2}-1\leq0} \atop {x^{2} >0}} \right.\\\\\left \{ {{(x-1)(x+1)} \leq0 \atop {x^{2}>0 }} \right." align="absmiddle" class="latex-formula">
+ - +
_________________[-1]________________[1]_________
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\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ 0 //////////////////////////////////
x ∈ [- 1 ; 0) ∪ (0 , 1]