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Question

Verify the cyclic symmetry of the following expressions if a, b and c are the variables:

(1) a(b − c) + b(c − a) + c(a − b)

(2) ab(a + b) + bc(b + c) + ca(c + a)

(3) a2b(a − b) + b2c(b − c) + c2a(c − a)

(4) a2(a + b) + b2(b + c) + c2(c + a)

(5) ab2(a − b) + bc2(b − c) + ca2(c − a)

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Solution

(1) The given expression is ... (1)

Changing the variables cyclically, we get ... (2)

Comparing expressions (1) and (2), we observe that they are same.

Hence, the expression is a cyclic symmetrical expression.

(2) The given expression is ... (1)

Changing the variables a, b and c cyclically, we get ... (2)

Comparing expressions (1) and (2), we observe that they are same.

Hence, the expression is a cyclic symmetrical expression.

(3) The given expression is ... (1)

Changing the variables a, b and c cyclically, we get ... (2)

Comparing expressions (1) and (2), we observe that they are same.

Hence, the expression is a cyclic symmetrical expression

(4) The given expression is ... (1)

Changing the variables a, b and c cyclically, we get ... (2)

Comparing expressions (1) and (2), we observe that they are same.

Hence, the expression is a cyclic symmetrical expression

(5) The given expression is ... (1)

Changing the variables a, b and c cyclically, we get ... (2)

Comparing expressions (1) and (2), we observe that they are same.

Hence, the expression is a cyclic symmetrical expression.


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