
 f(t) = 0.5*sin(t) + 0.5*sin(2*t)+ 0.5*sin(3*t)


 f(t) = 0.5*sin(t);;4
 f(t) = 0.5*sin(2*t);;5
 f(t) = 0.5*sin(3*t);;10
