cos(pi) cos(2*pi) ------- + --------- 5 5
cos(pi)/5 + cos(2*pi)/5
0
0.e-126
nan
1 cos(pi) - + ------- 5 5
1 1 --------- + ----------- 5*sec(pi) 5*sec(2*pi)
/3*pi\ /5*pi\ sin|----| sin|----| \ 2 / \ 2 / --------- + --------- 5 5
sin(3*pi/2)/5 + sin(5*pi/2)/5