4. Factorize:
(e) a + 2a2-a-2
(g) x² + 2xy + 2y-1
(i) 2(xy + zw) - x? -y? +z2+w2
(b) x² + xy - 2y - 4
(d) x(x - 2) - y(y-2)
(f) (1 -a?)(1-62) + 4ab
(h)1-a² + 2ab-b2
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