if x-1/x=6 ,then find x^3-1/x^3
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=>x-1/x = 6
=>x-1 = 6x
=>5x = -1
=>x = -1/5
x^3-1/x^3
={(-1/5)^3 - 1}/(-1/5)^3
={(-1/125)-1}/(-1/125)
=(-126/125) × (125/-1)
=126
=>x-1 = 6x
=>5x = -1
=>x = -1/5
x^3-1/x^3
={(-1/5)^3 - 1}/(-1/5)^3
={(-1/125)-1}/(-1/125)
=(-126/125) × (125/-1)
=126
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