5.5 The Substitution Rule/27

Failed to parse (unknown function "\begin{align}"): {\displaystyle \begin{align} & \int \cfrac{z^2}{\sqrt[3]{1+z^3}} dz \\[2ex] & \int{tdt} \\[2ex] & \cfrac{t^2}{2} \\[2ex] & \cfrac{\sqrt[3]{(1+z^3)^2}{2} +c \end{align} }