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Standard algebraic identities a2 - b2

Factor: 9x2369x^2-36


Factor: 121x449121x^4-49


Factor: x281x^2-81


Factor: x24x^2-4


Factor: 9x4169x^4-16


Factor: 4x2164x^2-16


Factor: x2121x^2-121


Factor: 4x2164x^2-16


Factor: 4x21004x^2-100


Factor: 81x1216981x^{12}-169