> plot(x^3-2*cos(x)+1.9,x=-1..1);

> fsolve(x^3-2*cos(x)+1.9,x,x=-1..-0.6);

> fsolve(x^3-2*cos(x)+1.9,x,x=-0.6..0);

> diff(x^3-2*cos(x)+1.9,x);diff(%,x);diff(%,x);

> plot({3*x^2+2*sin(x),6*x+2*cos(x),6-2*sin(x)},x,x=-10..10);

> series(cos(x),x,10);

>

>