5.5 The Substitution Rule/7

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{x\cdot sin{(x^2)}} dx \\[2ex] & \cfrac{sin(t)}{2} dt \end{align} }