Find the value of x at the minimum point of the curve y = x3 + x2 - x + 1
Find \(\int\) cos4 x dx
\(\begin{array}{c|c} No & 0 & 1 & 2 & 3 & 4 & 5 \\ \hline Frequency & 1 & 4 & 3 & 8 & 2 & 5 \end{array}\). From the table above, find the median and range of the data respectively.