So: [ M_4 = \frac\pi4 \left[ 2\sin(\pi/8) + 2\sin(3\pi/8) \right] = \frac\pi2 [\sin(22.5^\circ) + \sin(67.5^\circ)] ]
[ L_n = \frac2n [4n + 3(n-1)] = \frac2n (7n - 3) = 14 - \frac6n ] sumas de riemann ejercicios resueltos pdf
[ M_4 \approx \frac\pi2 \times 1.306563 \approx 1.896 ] So: [ M_4 = \frac\pi4 \left[ 2\sin(\pi/8) +