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• Identical expressions

• (one - x)^(- two) = zero
• (1 minus x) to the power of ( minus 2) equally 0
• (one minus x) to the power of ( minus two) equally zero
• (1 - x)(-2) = 0
• 1 - x-2 = 0
• 1 - x^-2 = 0

• Similar expressions

• (1 - x)^(2) = 0
• (1 + x)^(-2) = 0