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efectuando
16x^8+16x^4+4
b) (1+8x^3)^2
efectuando
1+16x^3+64x^6
c) (1-7x^2)^2
efectuando
1-14x^2+49x^4
d) (5x^2r-7xr^2)^2
efectuando
25(x^4)(r^2)-70(x^3)(r^3)+49(x^2)(r^4)