(-1)2n+1+(-1)2n=

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(-1)2n+1+(-1)2n=(-1)2n+1+(-1)2n=(-1)2n+1+(-1)2n=(-2)2n+1(-1)^2n+1+(-1)^2n=-1+1=0-4n+1

(-1)2n+1+(-1)2n=
(-1)2n+1+(-1)2n=

(-1)2n+1+(-1)2n=
(-2)2n+1

(-1)^2n+1+(-1)^2n=-1+1=0

-4n+1