Answer:
\[LHS={{(AB)}^{2}}=(AB)\,(AB)\] [where, \[AB=BA\]] then we can write \[{{(AB)}^{2}}=A\cdot AB\cdot B={{A}^{2}}{{B}^{2}}\] \[\therefore \] \[{{(AB)}^{2}}={{A}^{2}}{{B}^{2}},\]when \[AB=BA\]
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