((440*cos(pi*(1/4)))*cos(pi*n))/((pi^2*(1/4))*n)
((440*cos(pi/4))*cos(pi*n))/((pi^2/4)*n)
880*sqrt(2)*cos(pi*n)/(pi^2*n)
44.5813208026286*cos(pi*m)*cos(pi*n)/(m*n)
440*cos(pi*m)*cos(pi*n)
———————–
2
pi *m*n
440*cos(pi*m)*cos(pi*n)
———————–
2
pi *m*n
440*cos(pi*m)*cos(pi*n)
———————–
2
pi *m*n
440*cos(pi*m)*cos(pi*n)
———————–
2
pi *m*n
440*cos(pi*m)*cos(pi*n)
———————–
2
pi *m*n
440*cos(pi*m)*cos(pi*n)
———————–
2
pi *m*n