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Prove polynomial identities

Which of the following polynomial equations are valid identities?
A. (x2+2y)(x23y)=x46y2\text{A. }(x^2+2y)(x^2-3y)=x^4-6y^2
B. k3r3=(k2+r)(kr2)\text{B. }k^3-r^3=(k^2+r)(k-r^2)
Choose 1 answer:
Choose 1 answer: