f(x)=x^2 g(x)=x^3 h(x)=1/x
f(x)=3*sin x g(x)=5*cos(2*x-pi/2) h(x)=f(x)+g(x)
x(t)=5*sin(3*t) y(t)=5*cos(5*t)
x1(t)=0.5*(t-2*sin t); D[-4*pi, 4*pi] y1(t)=0.5*(1-2*cos t)