$n$ is natural number. What is the result of $(-1)^{2n}-(-1)^{4n-1}-1^{n+1}-(-2)^3$

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$n$ is natural number.

What is the result of $(-1)^{2n}-(-1)^{4n-1}-1^{n+1}-(-2)^3$

My attempt:

We know that $2n$ means even, and $4n -1$ means an odd number.

Here we get

$$+1 -1 +1+8 = 9$$

Sorry If I was truly wrong, just wanted to show something I did.

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It should be just $$1+1-1+8=9.$$

Because $$(-1)^{2n}=\left((-1)^2\right)^n=1^n=1;$$ $$-(-1)^{4n-1}=-(-1)^{-1}\cdot(-1)^{4n}=(-1)^{4n}=\left((-1)^4\right)^n=1^n=1;$$ $$-1^n=-1$$ and $$-(-2)^3=-(-8)=8.$$