把下列各式分解因式:
(1)x4-7x2+1;
(2)x4+x2+2ax+1-a2
(3)(1+y)2-2x2(1-y2)+x4(1-y)2
(4)x4+2x3+3x2+2x+1.
(1)x4-7x2+1
=x4+2x2+1-9x2
=(x2+1)2-(3x)2
=(x2+3x+1)(x2-3x+1);

(2)x4+x2+2ax+1-a2
=x4+2x2+1-x2+2ax-a2
=(x2+1)-(x-a)2
=(x2+1+x-a)(x2+1-x+a);

(3)(1+y)2-2x2(1-y2)+x4(1-y)2
=(1+y)2-2x2(1-y)(1+y)+x4(1-y)2
=(1+y)2-2x2(1-y)(1+y)+[x2(1-y)]2
=[(1+y)-x2(1-y)]2
=(1+y-x2+x2y)2

(4)x4+2x3+3x2+2x+1
=x4+x3+x2+x3+x2+x+x2+x+1
=x2(x2+x+1)+x(x2+x+1)+x2+x+1
=(x2+x+1)2
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