The commutator " id="MathJax-Element-61-Frame" role="presentation" style="position: relative;" tabindex="0"> " id="MathJax-Element-119-Frame" role="presentation" style="position: relative;" tabindex="0">
\([x,p_x^2]\) is equal to_____ along the " id="MathJax-Element-64-Frame" role="presentation" style="position: relative;" tabindex="0"> " id="MathJax-Element-122-Frame" role="presentation" style="position: relative;" tabindex="0">
\(x\)-axis.
1
\(2iℏp_x\)
2
\(2iℏx\)
3
0
4
\(iℏ(x^2+p_x^2)\)