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kerja sperti biasa jdi (z+y) / 2yz
lalu fokus ke 4y^2 - 4z^2
(2y)^2 - (2z)^2
(2y-2z)(2y + 2z)
lalu jdiin satu sehingga jdi (z+y) / 2yz / (2y-2z)(2y + 2z)
(z+y) / 2yz . 2(y-z) . 2(y+z)
1 / 4yz . (y^2 - x^2)
1 / 4y^3z - 4yz^3