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    1 ##DESCRIPTION
    2 ## Algebra: Trigonometric functions of angles
    3 ##ENDDESCRIPTION
    4 
    5 ##KEYWORDS('algebra', 'trigonometric functions of angles', 'exact value')
    6 
    7 ## tcao , PAID on 11-24-2003
    8 
    9 ## DBsubject('Trigonometry')
   10 ## DBchapter('Trigonometric Functions of Angles')
   11 ## DBsection('Trigonometric Functions of Angles')
   12 ## Date('6/3/2002')
   13 ## Author('')
   14 ## Institution('')
   15 ## TitleText1('Precalculus')
   16 ## EditionText1('3')
   17 ## AuthorText1('Stewart, Redlin, Watson')
   18 ## Section1('6.3')
   19 ## Problem1('7')
   20 DOCUMENT();        # This should be the first executable line in the problem.
   21 
   22 loadMacros(
   23 "PG.pl",
   24 "PGbasicmacros.pl",
   25 "PGchoicemacros.pl",
   26 "PGanswermacros.pl",
   27 "PGauxiliaryFunctions.pl"
   28 );
   29 
   30 TEXT(beginproblem());
   31 $showPartialCorrectAnswers = 0;
   32 
   33 TEXT(EV2(<<EOT));
   34 Find the exact value.
   35 $BR
   36 \(\sin 150^\circ = \) \{ans_rule(15)\};
   37 $BR
   38 \(\cos 150^\circ = \) \{ans_rule(15)\};
   39 $BR
   40 EOT
   41 
   42 $ans1=1/2;
   43 $ans2=-sqrt(3)/2;
   44 ANS(num_cmp($ans1));
   45 ANS(num_cmp($ans2));
   46 
   47 ENDDOCUMENT();        # This should be the last executable line in the problem.