(x/2 - x/3 )power2..... expand ?
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(x/2 - x/3 )² = x²/4 + x²/9 - 2×(x/2)×(x/3) (as (a-b)² = a² + b² -2ab)
= x²/4 + x²/9 - x²/3
= x²/4 + x²/9 - x²/3
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