Solución al ejercicio
6694
![\int_{\frac{\pi}{2}}^{\pi} (cos \:x - sen \:x)dx = \left. sen \:x + cos \:x\right]_{\frac{\pi}{2}}^{\pi} =](local/cache-TeX/3f12e66d1a4cbf77454fae5e05a3a614.png "\int_{\frac{\pi}{2}}^{\pi} (cos \:x - sen \:x)dx = \left. sen \:x + cos \:x\right]_{\frac{\pi}{2}}^{\pi} =")
