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Expand (x^(3)-(1)/(x^(2)))^(7)...

Expand `(x^(3)-(1)/(x^(2)))^(7)`

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`(x^(3)-(1)/(x^(2)))^(7)=.^(7)C_(0)(x^(3))^(7)-.^(7)C_(1)(x^(3))^(6)((1)/(x^(2)))+.^(7)C_(2)(x^(3))^(5)((1)/(x^(2)))^(2)_.^(7)C_(3)(x^(3))^(4)((1)/(x^(2)))^(3)` . . .
. . .`+.^(7)C_(4)(x^(3))^(3)((1)/(x^(2)))^(4)-.^(7)C_(5)(x^(3))^(2)((1)/(x^(2)))^(5)+.^(7)C_(6)(x^(3))((1)/(x^(2)))^(6)-.^(7)C_(7)((1)/(x^(2)))^(7)`
`=x^(21)-7x^(18)((1)/(x^(2)))+21x^(15)((1)/(x^(4)))-35(x^(12))((1)/(x^(6)))+35(x^(9))((1)/(x^(8)))-21(x^(6))((1)/(x^(10)))+7(x^(3))((1)/(x^(12)))-((1)/(x^(14)))`
`=x^(21)-7x^(16)+21x^(11)-35x^(6)+35x-(21)/(x^(4))+(7)/(x^(4))+(7)/(x^(9))-(1)/(x^(14))`
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