factorise y cube -1 upon y cube, if y - 1/y equal to 9
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y^3-1/y^3
= ) (y-1/y)^3 = y^3-1/y^3 - 3 y*1/y(y - 1/y)
=) 9^3 = y^3 - 1/y^3 - 3*9
=) 729+27. = y^3-1/y^3
=)y^3-1/y^3 = 756
= ) (y-1/y)^3 = y^3-1/y^3 - 3 y*1/y(y - 1/y)
=) 9^3 = y^3 - 1/y^3 - 3*9
=) 729+27. = y^3-1/y^3
=)y^3-1/y^3 = 756
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