'diff(exp(x^2), x)$ %=ev(%, nouns);

 'diff(exp(x^2),x,2)$ %=ev(%,nouns);

eq : x^2 +y^2 = c; depends(y,x);

dydx:solve(diff(eq, x),'diff(y,x));

remove(y, dependency);

'diff(exp(a*x*y^2),x,1,y,2)$ %=ev(%, nouns);

'integrate(x/(x^3+1),x)$ %=ev(%,nouns);

'integrate(x/(x^3+1), x,1,2); %=ev(%, nouns);

'sum(k^7, k,1,20)$ %=ev(%, nouns);

 t : taylor(sin(tan(x))-tan(sin(x)),x,0,11);

 'limit((x^2-1)/(2*x^2-x-1),x,1)$ %=ev(%, nouns);

'limit( cos(x)^(1/x^3), x,0, plus)$ %=ev(%, nouns);