Which series equals ∫0xsinttdt\int_0^x \frac{\sin t}{t} dt∫0xtsintdt?
∑n=0∞(−1)nx2n+1(2n+1)(2n+1)!\sum_{n=0}^{\infty} \frac{(-1)^n x^{2n+1}}{(2n+1)(2n+1)!}∑n=0∞(2n+1)(2n+1)!(−1)nx2n+1
∑n=0∞(−1)nx2n(2n)(2n)!\sum_{n=0}^{\infty} \frac{(-1)^n x^{2n}}{(2n)(2n)!}∑n=0∞(2n)(2n)!(−1)nx2n
∑n=0∞(−1)nx2n+1(2n+1)!\sum_{n=0}^{\infty} \frac{(-1)^n x^{2n+1}}{(2n+1)!}∑n=0∞(2n+1)!(−1)nx2n+1
∑n=0∞(−1)nx2n+12n+1\sum_{n=0}^{\infty} \frac{(-1)^n x^{2n+1}}{2n+1}∑n=0∞2n+1(−1)nx2n+1