6.1 Areas Between Curves/22

${\begin{aligned}&\color {red}\mathbf {y=\sin({\frac {\pi x}{2}})} &\color {royalblue}\mathbf {y=x} \\\end{aligned}}$

Failed to parse (unknown function "\pix"): {\displaystyle \begin{align} \sin(\frac{\pix}{2} &= x x &= 0 \\ x &=1 \\ \end{align} }