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Question

Simplify: (i)(xa+bxc)ab(xb+cxa)bc(xc+axb)ca(ii)lmxlxm×mnxmxn×nlxnxl

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Solution

(i)(xa+bxc)ab(xb+cxa)bc(xc+axb)ca=(xa+bc)ab.(xb+ca)bc.(xc+ab)ca=x(ab)(a+bc).x(bc)(b+ca).x(ca)(c+ab)=xa2b2ac+bc.xb2c2ab+ac.xc2a2bc+ab=xa2b2ac+bc+b2c2ab+ac+c2a2bc+ab=x0=1

(ii)lmxlxm×mnxmxn×nlxnxl=(xlm)1lm×(xmn)1mn×(xnl)1nl=xlmlm.xmnmn.xnlnl=xlmlm+mnmn+nlnl=xlnmn+lmln+mnlmlnm=x0lmn=x0=1


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