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( 2a⁻² b³ / 4a⁻⁶ b⁻¹) ²
= 2a⁻⁴ b⁶ / 4a⁻¹² b⁻²
= a⁻⁴ b⁶ / 2a⁻¹² b⁻²
= 1/2 x a⁻⁴⁻⁽⁻¹²⁻⁾ b⁶⁻⁽⁻²⁾
= 1/2 x a ⁸ b ⁸