e) \( \sum_{k=2}^{\infty} \frac{(-1)^{k+1} k^{2}}{\sqrt{4 k^{4}+1}} \) f) \( \sum_{k=1}^{\infty} \frac{\sin ((2 k-1) \pi / 4)}{2^{k}} \)
Added by Ahsan N.
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