Question

find the definite integral

Answer 1

\[\int\limits_{0}^{\pi/8}xcos8xdx\]

Answer 2

\[\int\limits _0^{\pi /8}x \text{Cos}[8x]dx=-\frac{1}{32} \]

Answer 3

\[\int\limits x \text{Cos}[8x]dx=\frac{1}{64} \text{Cos}[8 x]+\frac{1}{8} x \text{Sin}[8 x] \]

Answer 4

thanks :]