DisableFunctions1

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This article has been retained as a historical document. It is not up-to-date and the formatting may be lacking. Use the information herein with caution.

This problem has been replaced with a newer version of this problem


Disabling Functions so Students Must Simplify Answers

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This PG code shows how to disable all functions and restrict student answers to fractions.


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PG problem file Explanation

Problem tagging data

Problem tagging:

DOCUMENT();

loadMacros(
  'PGstandard.pl',
  'MathObjects.pl',
  'contextFraction.pl',
  'PGML.pl',
  'PGcourse.pl'
);
TEXT(beginproblem());

Initialization:

  • The contextFraction.pl is loaded since we used the Fraction-NoDecimals</text> context.

Context('Fraction-NoDecimals');

# Prevent pi from becoming 3.1415... and cos(pi) from
# becoming -1.
Context()->constants->set(pi => {keepName => 1});

# The next context changes are not necessary to
# prevent cos(pi) from becoming -1, but they cannot hurt.
Context()->flags->set(
  reduceConstants=>0,
  reduceConstantFunctions=>0
);

$f1 = Formula('cos(pi)');
$f2 = Formula('sin(pi/3)');

Context()->functions->disable('All');
Context()->functions->enable('sqrt');

$answer1 = Compute('-1');
$answer2 = Compute('sqrt(3)/2');

Setup: We choose a context that requires fractions as answers and does not allow decimals. After constructing the formulas involving trig functions, we disable all functions and re-enable the sqrt() function. This means that students are allowed to type in fractions and square roots, but not much else (e.g., they'll get an error message if they type in a trig function).

Note that $f1 and $f2 are MathObject Formulas, which do not get reduced since pi is set to keep its name. If $f1 and $f2 used Compute instead, then the results would be -1 and 0.866... instead of cos(\pi) and sin(\pi/3) as desired.

BEGIN_PGML
Enter your answers as simplified fractions.

+ [` [$f1] = `] [_____________]{$answer1}

+ [` [$f2] = `] [_____________]{$answer2}

[@ helpLink('fractions') @]*
END_PGML

Main Text:

BEGIN_PGML_SOLUTION
The cosine of an angle is zero when
the angle is an integer multiple of \( \pi \).
END_PGML_SOLUTION

ENDDOCUMENT();

Solution:

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