а) (3x + y^2)(3x - y^2) = 9x^2 - 3xy^2 + 3xy^2 - y^4 = 9x^2 - y^4
в) (a - x)^2(x + a)^2 = (a^2 - 2ax + x^2)(x^2 + 2ax + a^2) = a^4 - 2a^3x + a^2x^2 - 2a^3x + 4a^2x^2 - 2ax^3 + a^2x^2 - 2ax^3 + x^4 = a^4 - 4a^3x + 6a^2x^2 - 4ax^3 + x^4
б) (a^3 - 6a)^2 = a^6 - 12a^4 + 36a^2
а) (3x + y^2)(3x - y^2) = 9x^2 - 3xy^2 + 3xy^2 - y^4 = 9x^2 - y^4
в) (a - x)^2(x + a)^2 = (a^2 - 2ax + x^2)(x^2 + 2ax + a^2) = a^4 - 2a^3x + a^2x^2 - 2a^3x + 4a^2x^2 - 2ax^3 + a^2x^2 - 2ax^3 + x^4 = a^4 - 4a^3x + 6a^2x^2 - 4ax^3 + x^4
б) (a^3 - 6a)^2 = a^6 - 12a^4 + 36a^2