Here is an example....

The question below expects an expression. If the student erroneously

enters 3x/5 . Webwork prints the following syntax error....

`Scalar found where operator expected at line 6 of (eval 8608), near "3 $x"`

`(Missing operator before $x?)`

If a right answer is entered there is no syntax error.

How "hide" these error messages from student when THEY enter something goofy?

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Context()->flags->set(tolerance => 0.1);

$ans = 2;

BEGIN_PGML

What is the derivative of [`-2/x`]?

[____________]{Formula("2/x^2")}

END_PGML

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