$$\frac { \alpha ^ { 2 } } { \beta } \times \frac { \beta ^ { 2 } } { d }$$
$\frac{\beta \alpha ^{2}}{d}$
$$\frac{\alpha ^{2}\beta ^{2}}{\beta d}$$
$$\frac{\beta \alpha ^{2}}{d}$$
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$\frac{\alpha ^{2}}{d}$
