Suma de senos y cosenos
S=sin(a)+sin(2a)+sin(3a)+…+sin(na)
S=(sin(na/2)*sin((n+1)*(a/2)))/sin(a/2)
C=cos(a)+cos(2a)+cos(3a)+…+cos(na)
C=(sin(na/2)*cos((n+1)*(a/2)))/sin(a/2)
Ejemplos:
Sen1+sen2+sen3+sen4=sen2*sen(5/2)/sen(1/2)=0.174444…
Cos1+cos2+cos3+cos4=sen2*cos(5/2)/sen(1/2)=3.995…
