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\frac{\alpha \alpha ^{2}}{\alpha ^{2}\beta ^{2}}+\frac{\beta \beta ^{2}}{\alpha ^{2}\beta ^{2}}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of \beta ^{2} and \alpha ^{2} is \alpha ^{2}\beta ^{2}. Multiply \frac{\alpha }{\beta ^{2}} times \frac{\alpha ^{2}}{\alpha ^{2}}. Multiply \frac{\beta }{\alpha ^{2}} times \frac{\beta ^{2}}{\beta ^{2}}.
\frac{\alpha \alpha ^{2}+\beta \beta ^{2}}{\alpha ^{2}\beta ^{2}}
Since \frac{\alpha \alpha ^{2}}{\alpha ^{2}\beta ^{2}} and \frac{\beta \beta ^{2}}{\alpha ^{2}\beta ^{2}} have the same denominator, add them by adding their numerators.
\frac{\alpha ^{3}+\beta ^{3}}{\alpha ^{2}\beta ^{2}}
Do the multiplications in \alpha \alpha ^{2}+\beta \beta ^{2}.