7.1 Integration By Parts/19

Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://en.wikipedia.org/api/rest_v1/":): {\displaystyle \begin{align} \int_{0}^{\pi} (t sin3t) dt\\[2ex] &= \int_{0}^{\pi} \frac{1}{2} t^{2} \frac{1}{2} sin3t^{2}\\[2ex] &= \int_{0}^{\pi} \frac{1}{2} \pi^{2} \frac{1}{2} sin3\pi^{2}\\[2ex] \end{align} }