দেওয়া আছে, a + b + c = 0
⇒ a + b = - c
⇒ a + c = - b
⇒ b + c = - a
∴ প্রদত্ত রাশি =b+c23bc+c+a23ca+a+b23ab
=a-23bc+-b23ca+-c23ab
=a23bc+b23ca+c23ab
=a3+b3+c33abc
=a+b+c3-3a+bb+cc+a3abc
=03-3.-c.-a.-b3abc
=0+3abc3abc
=3abc3abc
=1
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