Squares and Cubes

Algebra Level 1

 I.  x2=y2x=y\text{ I. } \ x^2=y^2 \quad \Rightarrow \quad x=y  II.  x3=y3x=y \text{ II. } \ x^3=y^3 \quad \Rightarrow \quad x = y

Which of the above statements is/are true for real xx and yy?

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