View of /trunk/NationalProblemLibrary/Rochester/setTrig07Identity/srw7_1_35.pg

    1 ##DESCRIPTION
    2 ## Algebra: Analytic Trigonometry
    3 ##ENDDESCRIPTION
    4 
    5 ##KEYWORDS('algebra', 'analytic trigonometry', 'trigonometric identities')
    6 
    7 ## tcao , PAID on 11-24-2003
    8 
    9 ## DBsubject('Trigonometry')
   10 ## DBchapter('Analytic Trigonometry')
   11 ## DBsection('Trigonometric Identities')
   12 ## Date('6/3/2002')
   13 ## Author('')
   14 ## Institution('')
   15 ## TitleText1('Precalculus')
   16 ## EditionText1('3')
   17 ## AuthorText1('Stewart, Redlin, Watson')
   18 ## Section1('7.1')
   19 ## Problem1('33')
   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 
   34 TEXT(EV2(<<EOT));
   35 Simplify and write the trigonometric expression in terms of sine and cosine:
   36 $BR
   37 \( (1-\cos y)(1+\cos y)  = (f(y))^2 \)
   38 $BR
   39 \(f(y)=\) \{ans_rule(10)\}.
   40 $BR
   41 EOT
   42 
   43 $ans1="sin(y)";
   44 
   45 ANS(fun_cmp($ans1,var=>['y']));
   46 
   47 ENDDOCUMENT();        # This should be the last executable line in the problem.