AIR MATH

Math Question

Which of the following is not a polynomial identity? A. \( \left(a^{2}+b^{2}\right)\left(c^{2}+d^{2}\right)=(a c-b d)^{2}+(a d+b c)^{2} \) B. \( a^{3}-b^{3}=(a-b)\left(a^{2}+a b+b^{2}\right) \) C. \( a^{3}+b^{3}=(a-b)\left(a^{2}-a b+b^{2}\right) \) D. \( a^{2}-b^{2}=(a+b)(a-b) \)

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