diff(log(sqrt(1+x^2)+x),x$2);
2.> diff((sin(x)^2),x$3);
3.> diff(log(sqrt(1+x^2)+x),x$2);
4.> diff((sqrt(1+x^4)+log(x)),x$3);
5.> diff((exp(sin(x)^2)),x$3);
6.> diff((log(sin(x)+x)),x$2);
>
> Sum(Product(i^2+factorial(k),k=1..6),i=1..5)=sum(product(i^2+factorial(k),k=1..6),i=1..5);
>
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