Zad. Rozwiąż:
a) (x-2y) (x+2y) - (2y-x) (2y+x)
b) (a-b) (a+b) (b-a) (a+b)
c) -(4m+1) (1+4m) (1-4m) (-4m+1)
d) -(3p-1) (1+3p) (1-3p) (1+3p)
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c)