Question

$\int\limits^\pi _0 4sin{x} \, dx$

Answer 1

$\displaystyle\\\int\limits^\pi_0 {4\sin(x)} \, dx =(-4\cos(x))\mid^\pi_0=-4\cos(\pi)-(-4\cos(0))=-4*(-1)-\\\\\\-(-4*1)=4+4=8$