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= [ 6 (²/₁) x¹/² - ²/₅ x ⁵/² ]⁴₁
= [ 3 x¹/² - ²/₅ x⁵/² ]⁴₁
= 3(4¹/²- 1¹/²) - (²/₅)(4⁵/² - 1⁵/²)
= 3(2-1) - (²/₅)(32 -1)
= 3(1) - (²/₅)(31)
= 3 - ⁶²/₅ = - 9 ²/₅