find the value of x3+y3-3xy+1, when x+y=-1
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X power 3 + y power 3 - 3xy+1 can be written as x power 3 + y power 3 - 3xy ( x+y)
= x power 3 + y power 3 - 3xy
=( x + y) ^3
= x power 3 + y power 3 - 3xy
=( x + y) ^3
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