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• Identical expressions

• two *(one + x^(- two)) = zero
• 2 multiply by (1 plus x to the power of ( minus 2)) equally 0
• two multiply by (one plus x to the power of ( minus two)) equally zero
• 2*(1 + x(-2)) = 0
• 2*1 + x-2 = 0
• 2(1 + x^(-2)) = 0
• 2(1 + x(-2)) = 0
• 21 + x-2 = 0
• 21 + x^-2 = 0

• Similar expressions

• 2*(1 + x^(2)) = 0
• 2*(1 - x^(-2)) = 0