The sum of the first n terms of the sequence {(- 1) ^ n * a ^ 4N} (a is not equal to 0) is equal to

The sum of the first n terms of the sequence {(- 1) ^ n * a ^ 4N} (a is not equal to 0) is equal to

(-1)^n×a^4n=(-a^4)^n
Obviously - A ^ 4 ≠ 1, the above formula is an equal ratio sequence. The sum of the first n terms is - A ^ 4 × (1-A ^ 4N) / (1 + A ^ 4)

Elden Ring Premiere

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