> (cos(x),x);

> diff(sin(x),x);

> sum(k^2,k=1..n);

> expand((x+y+z)^2);

> factor(x^12-1);

> int(sin(x)^2,x=0..Pi);

> solve(x^2-3*x-1);

> simplify(a/b+c/d);

> eval((2/7)^17);

> evalf((2/7)^17);

> expand(sin(x+y));

> combine(sin(x)*sin(y));

> solve(x^3-2*x+7);

> evalf(%);

> solve({3*x+4*y-3,2*x+y-5});

> plot(cos(x)+cos(2*x),x=-5..5);

> plot3d(x^2+y^2,x=-1..1,y=-1..1);

> f:=abs(x-1);

> plot(f,x=-2..2);

> f:=abs(x-1)+(abs(x-2)+abs(abs(x+1)+abs(x-3)));

> plot(f,x=-5..5);

> plot([cos(9*x),sin(10*x),x=0..2*Pi]);

> x:=(1+cos(t)/2)*cos(t/6-sin(2*t)/12);

> y:=(1+cos(t)/2)*sin(t/6-sin(2*t)/12);

> plot([x,y,t=0..12*Pi]);

> restart;

> expand(sin(x+y+z));

> combine(sin(x)*sin(y)*sin(z));

> limit((1-x^2/2-cos(x))/x^4,x=0);

>