> evalf(exp(20),20);

> 100!;

> evalf(Pi,20);

> 5/3;

> evalf(5/3,20);

>

> simplify(1/a+1/b+1/c);

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

> expand((1+x+x^2)^2);

> factor(x^6-1);

> factor(x^6-1,{3^(1/2),I});

> factor(x^2+x-1,5^(1/2));

> ifactor(2^(2^5)+1);

> diff(sin(x^2+3*x+1),x);

> diff(log(x),x$4);

> evalf(sin(Pi/8),20);

> int(tan(x),x);

> int(sin(x)*cos(x),x);

> int(x^2*cos(x)*exp(x),x);

> evalf(int(x^2*cos(x)*exp(x),x=0..1),20);

> series(exp(x),x=1,10);

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

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

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

> solve(x^3-1);

> solve({x+y=1,x-y=2});

> sum(n^3,n=1..k);

> implicitdiff(x^2*y+y^3*x,y,x);

> implicitdiff(x^2*y+y^3*x,x,y);

>