5.3 The Fundamental Theorem of Calculus/41

Failed to parse (unknown function "\begin{cases}"): {\displaystyle \int\limits_{0}^{\pi}f(x)dx where f(x) = \begin{cases} sin(x), & \text{if }\text{ 0<=x<= π/2} \\ cos(x), & \text{if }\text{ π/2<=} \end{cases} }