## DESCRIPTION
## Trigonometry: periodic answers
## ENDDESCRIPTION

## KEYWORDS('trigonometry', 'periodic answer')

## DBsubject('WeBWorK')
## DBchapter('WeBWorK Tutorial')
## DBsection('Fort Lewis Tutorial 2011')
## Date('01/30/2011')
## Author('Paul Pearson')
## Institution('Fort Lewis College')
## TitleText1('')
## EditionText1('')
## AuthorText1('')
## Section1('')
## Problem1('')


###########################
#  Initialization

DOCUMENT();

loadMacros(
"PGstandard.pl",
"MathObjects.pl",
"AnswerFormatHelp.pl",
);

TEXT(beginproblem());


###########################
#  Setup

Context("Numeric");

$answer = Real("pi/2")->with(period=>pi);


###########################
#  Main text

Context()->texStrings;
BEGIN_TEXT
Enter a solution to \( \cos(\theta) = 0 \).
$BR
$BR
\( \theta = \)
\{ ans_rule(10) \}
\{ AnswerFormatHelp("angles") \}
END_TEXT
Context()->normalStrings;


###########################
#  Answer evaluation

$showPartialCorrectAnswers = 1;

ANS( $answer->cmp() );


###########################
#  Solution

Context()->texStrings;
BEGIN_SOLUTION
${PAR}SOLUTION:${PAR}
The cosine of an angle is zero when 
the angle is an integer multiple of \( \pi \).
END_SOLUTION
Context()->normalStrings;

COMMENT('MathObject version.');

ENDDOCUMENT();