21. Given the harmonic function, evaluate its harmonic conjugate to construct the holomorphic function: (Баллов: 2) 2y-6x2y +4x? - 7xy- 4y2 + 3x + 4y – 4 O 9x2 – 16xy + 3x + 3y - 16y2 - 28)x? + 2y - 4 O 2x3 + x - 6xy + 8xy- 4x - + 3y O It is not a harmonic functior O 5x2 - 6xy + 2x + 2y - 9y - 27yx +21y - 4

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