Restrict Answers to a Constant

Restricting answers that should reduce to a constant.

Return to the PG docs home

Complete Code

Download file: RestrictingFunctions.pg

See Also

PG problem file

Explanation

DOCUMENT();

loadMacros('PGstandard.pl', 'PGML.pl', 'PGcourse.pl');

Preamble

These standard macros need to be loaded. 
$expr  = Formula("sin(x)^2 + cos(x)^2");
$deriv = Compute(0)->cmp(showTypeWarnings => 0);

Setup

Here we’ve turned off type warnings in the answer checking, so that a student entering an un-simplified answer (e.g., 2 sin(x) cos(x) + 2 cos(x) (-sin(x))) will have it marked wrong (but not get feedback that says “you should have entered a number”).

BEGIN_PGML
Find and completely simplify:

[``\frac{d}{dx}\bigl(\sin^2 x + \cos^2 x\bigr) = ``] [__]{$deriv}
END_PGML

Statement

This is the problem statement in PGML. 
BEGIN_PGML_SOLUTION
Solution explanation goes here.
END_PGML_SOLUTION

ENDDOCUMENT();

Solution

A solution should be provided here.