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1-3x+3x^{2}-x^{3}-\left(-x-1\right)^{3}
Use binomial theorem \left(a-b\right)^{3}=a^{3}-3a^{2}b+3ab^{2}-b^{3} to expand \left(1-x\right)^{3}.
1-3x+3x^{2}-x^{3}-\left(\left(-x\right)^{3}-3\left(-x\right)^{2}+3\left(-x\right)-1\right)
Use binomial theorem \left(a-b\right)^{3}=a^{3}-3a^{2}b+3ab^{2}-b^{3} to expand \left(-x-1\right)^{3}.
1-3x+3x^{2}-x^{3}-\left(\left(-x\right)^{3}-3x^{2}+3\left(-x\right)-1\right)
Calculate -x to the power of 2 and get x^{2}.
1-3x+3x^{2}-x^{3}-\left(-x\right)^{3}+3x^{2}-3\left(-x\right)+1
To find the opposite of \left(-x\right)^{3}-3x^{2}+3\left(-x\right)-1, find the opposite of each term.
1-3x+6x^{2}-x^{3}-\left(-x\right)^{3}-3\left(-x\right)+1
Combine 3x^{2} and 3x^{2} to get 6x^{2}.
1-3x+6x^{2}-x^{3}-\left(-x\right)^{3}+3x+1
Multiply -3 and -1 to get 3.
1+6x^{2}-x^{3}-\left(-x\right)^{3}+1
Combine -3x and 3x to get 0.
2+6x^{2}-x^{3}-\left(-x\right)^{3}
Add 1 and 1 to get 2.
2+6x^{2}-x^{3}-\left(-1\right)^{3}x^{3}
Expand \left(-x\right)^{3}.
2+6x^{2}-x^{3}-\left(-x^{3}\right)
Calculate -1 to the power of 3 and get -1.
2+6x^{2}-x^{3}+x^{3}
Multiply -1 and -1 to get 1.
2+6x^{2}
Combine -x^{3} and x^{3} to get 0.
1-3x+3x^{2}-x^{3}-\left(-x-1\right)^{3}
Use binomial theorem \left(a-b\right)^{3}=a^{3}-3a^{2}b+3ab^{2}-b^{3} to expand \left(1-x\right)^{3}.
1-3x+3x^{2}-x^{3}-\left(\left(-x\right)^{3}-3\left(-x\right)^{2}+3\left(-x\right)-1\right)
Use binomial theorem \left(a-b\right)^{3}=a^{3}-3a^{2}b+3ab^{2}-b^{3} to expand \left(-x-1\right)^{3}.
1-3x+3x^{2}-x^{3}-\left(\left(-x\right)^{3}-3x^{2}+3\left(-x\right)-1\right)
Calculate -x to the power of 2 and get x^{2}.
1-3x+3x^{2}-x^{3}-\left(-x\right)^{3}+3x^{2}-3\left(-x\right)+1
To find the opposite of \left(-x\right)^{3}-3x^{2}+3\left(-x\right)-1, find the opposite of each term.
1-3x+6x^{2}-x^{3}-\left(-x\right)^{3}-3\left(-x\right)+1
Combine 3x^{2} and 3x^{2} to get 6x^{2}.
1-3x+6x^{2}-x^{3}-\left(-x\right)^{3}+3x+1
Multiply -3 and -1 to get 3.
1+6x^{2}-x^{3}-\left(-x\right)^{3}+1
Combine -3x and 3x to get 0.
2+6x^{2}-x^{3}-\left(-x\right)^{3}
Add 1 and 1 to get 2.
2+6x^{2}-x^{3}-\left(-1\right)^{3}x^{3}
Expand \left(-x\right)^{3}.
2+6x^{2}-x^{3}-\left(-x^{3}\right)
Calculate -1 to the power of 3 and get -1.
2+6x^{2}-x^{3}+x^{3}
Multiply -1 and -1 to get 1.
2+6x^{2}
Combine -x^{3} and x^{3} to get 0.