• Define a variable, f, to hold the square root of 81.

  Clear that variable using both methods mentioned in the article.

> f:=sqrt(81);

> f:='f';

> f;

> f:=sqrt(81);

> restart;

> f;

• Evaluate Pi with Digits=15 and Digits=20.

> Digits:=15;

> evalf(Pi);

> Digits:=20;

> evalf(Pi);

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