Consider f(x)=∫0xsinttdtf(x) = \int_0^x \frac{\sin t}{t} dtf(x)=∫0xtsintdt. Find the coefficient of x7x^7x7 in its Maclaurin series.
1/50401/50401/5040
1/7!1/7!1/7!
−1/(7⋅5!)-1/(7 \cdot 5!)−1/(7⋅5!)
−1/5040-1/5040−1/5040